774 lines
17 KiB
C++
774 lines
17 KiB
C++
// -*- C++ -*-
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/* thread.h: Locking and threading module definitions
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This file is part of Cygwin.
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This software is a copyrighted work licensed under the terms of the
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Cygwin license. Please consult the file "CYGWIN_LICENSE" for
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details. */
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#pragma once
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#define LOCK_MMAP_LIST 1
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#define WRITE_LOCK 1
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#define READ_LOCK 2
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/* resource.cc */
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extern size_t get_rlimit_stack (void);
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/* thread.cc */
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char *mythreadname (void);
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#include <pthread.h>
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#include <limits.h>
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#include "security.h"
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#include <errno.h>
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#include "cygerrno.h"
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#include "cygwait.h"
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class fast_mutex
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{
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public:
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fast_mutex () :
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lock_counter (0), win32_obj_id (0)
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{
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}
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~fast_mutex ()
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{
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if(win32_obj_id)
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CloseHandle (win32_obj_id);
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}
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bool init ()
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{
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lock_counter = 0;
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win32_obj_id = ::CreateEvent (&sec_none_nih, false, false, NULL);
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if (!win32_obj_id)
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{
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debug_printf ("CreateEvent failed. %E");
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return false;
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}
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return true;
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}
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void lock ()
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{
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if (InterlockedIncrement (&lock_counter) != 1)
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cygwait (win32_obj_id, cw_infinite, cw_sig | cw_sig_restart);
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}
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void unlock ()
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{
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if (InterlockedDecrement (&lock_counter))
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::SetEvent (win32_obj_id);
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}
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private:
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LONG lock_counter;
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HANDLE win32_obj_id;
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};
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class per_process;
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class pinfo;
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#define PTHREAD_MAGIC 0xdf0df045
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#define PTHREAD_MUTEX_MAGIC PTHREAD_MAGIC+1
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#define PTHREAD_KEY_MAGIC PTHREAD_MAGIC+2
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#define PTHREAD_ATTR_MAGIC PTHREAD_MAGIC+3
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#define PTHREAD_MUTEXATTR_MAGIC PTHREAD_MAGIC+4
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#define PTHREAD_COND_MAGIC PTHREAD_MAGIC+5
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#define PTHREAD_CONDATTR_MAGIC PTHREAD_MAGIC+6
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#define SEM_MAGIC PTHREAD_MAGIC+7
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#define PTHREAD_ONCE_MAGIC PTHREAD_MAGIC+8
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#define PTHREAD_RWLOCK_MAGIC PTHREAD_MAGIC+9
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#define PTHREAD_RWLOCKATTR_MAGIC PTHREAD_MAGIC+10
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#define PTHREAD_SPINLOCK_MAGIC PTHREAD_MAGIC+11
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#define PTHREAD_BARRIER_MAGIC PTHREAD_MAGIC+12
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#define PTHREAD_BARRIERATTR_MAGIC PTHREAD_MAGIC+13
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#define MUTEX_OWNER_ANONYMOUS ((pthread_t) -1)
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typedef uint32_t thread_magic_t;
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/* verifyable_object should not be defined here - it's a general purpose class */
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class verifyable_object
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{
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public:
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thread_magic_t magic;
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verifyable_object (thread_magic_t verifyer): magic (verifyer) {}
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virtual ~verifyable_object () { magic = 0; }
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};
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typedef enum
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{
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VALID_OBJECT,
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INVALID_OBJECT,
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VALID_STATIC_OBJECT
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} verifyable_object_state;
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template <class list_node> inline void
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List_insert (fast_mutex &mx, list_node *&head, list_node *node)
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{
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if (!node)
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return;
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mx.lock ();
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do
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node->next = head;
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while (InterlockedCompareExchangePointer ((PVOID volatile *) &head,
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node, node->next) != node->next);
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mx.unlock ();
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}
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template <class list_node> inline void
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List_insert_nolock (list_node *&head, list_node *node)
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{
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if (!node)
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return;
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do
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node->next = head;
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while (InterlockedCompareExchangePointer ((PVOID volatile *) &head,
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node, node->next) != node->next);
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}
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template <class list_node> inline void
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List_remove (fast_mutex &mx, list_node *&head, list_node *node)
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{
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if (!node)
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return;
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mx.lock ();
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if (head)
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{
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if (InterlockedCompareExchangePointer ((PVOID volatile *) &head,
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node->next, node) != node)
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{
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list_node *cur = head;
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while (cur->next && node != cur->next)
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cur = cur->next;
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if (node == cur->next)
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cur->next = cur->next->next;
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}
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}
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mx.unlock ();
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}
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template <class list_node> class List
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{
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public:
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List() : head(NULL)
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{
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mx_init ();
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}
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~List()
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{
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}
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void fixup_after_fork ()
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{
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mx_init ();
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}
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void insert (list_node *node)
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{
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List_insert (mx, head, node);
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}
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void remove (list_node *node)
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{
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List_remove (mx, head, node);
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}
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void for_each (void (list_node::*callback) ())
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{
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mx.lock ();
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list_node *cur = head;
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while (cur)
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{
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(cur->*callback) ();
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cur = cur->next;
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}
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mx.unlock ();
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}
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fast_mutex mx;
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list_node *head;
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protected:
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void mx_init ()
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{
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if (!mx.init ())
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api_fatal ("Could not create mutex for list synchronisation.");
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}
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};
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class pthread_key: public verifyable_object
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{
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DWORD tls_index;
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static bool iterate_dtors_once_more;
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public:
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static bool is_good_object (pthread_key_t const *);
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int set (const void *value) {TlsSetValue (tls_index, (void *) value); return 0;}
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void *get () const {return TlsGetValue (tls_index);}
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pthread_key (void (*)(void *));
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~pthread_key ();
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static void fixup_before_fork ()
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{
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keys.for_each (&pthread_key::_fixup_before_fork);
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}
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static void fixup_after_fork ()
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{
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keys.fixup_after_fork ();
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keys.for_each (&pthread_key::_fixup_after_fork);
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}
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static void run_all_destructors ()
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{
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/* POSIX requires at least four iterations of running destructors:
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If, after all the destructors have been called for all non-NULL
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values with associated destructors, there are still some non-NULL
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values with associated destructors, then the process is repeated.
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If, after at least {PTHREAD_DESTRUCTOR_ITERATIONS} iterations of
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destructor calls for outstanding non-NULL values, there are still
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some non-NULL values with associated destructors, implementations
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may stop calling destructors, or they may continue calling
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destructors until no non-NULL values with associated destructors
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exist, even though this might result in an infinite loop. */
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for (int i = 0; i < PTHREAD_DESTRUCTOR_ITERATIONS; ++i)
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{
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iterate_dtors_once_more = false;
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keys.for_each (&pthread_key::run_destructor);
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if (!iterate_dtors_once_more)
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break;
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}
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}
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/* List support calls */
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class pthread_key *next;
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private:
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static List<pthread_key> keys;
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void _fixup_before_fork ();
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void _fixup_after_fork ();
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void (*destructor) (void *);
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void run_destructor ();
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void *fork_buf;
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};
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class pthread_attr: public verifyable_object
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{
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public:
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static bool is_good_object(pthread_attr_t const *);
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int joinable;
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int contentionscope;
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int inheritsched;
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struct sched_param schedparam;
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void *stackaddr;
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size_t stacksize;
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size_t guardsize;
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char *name;
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pthread_attr ();
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~pthread_attr ();
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};
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class pthread_mutexattr: public verifyable_object
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{
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public:
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static bool is_good_object(pthread_mutexattr_t const *);
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int pshared;
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int mutextype;
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pthread_mutexattr ();
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~pthread_mutexattr ();
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};
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class pthread_mutex: public verifyable_object
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{
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public:
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static void init_mutex ();
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static int init (pthread_mutex_t *, const pthread_mutexattr_t *attr,
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const pthread_mutex_t);
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static bool is_good_object (pthread_mutex_t const *);
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static bool is_initializer (pthread_mutex_t const *);
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static bool is_initializer_or_object (pthread_mutex_t const *);
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static bool is_initializer_or_bad_object (pthread_mutex_t const *);
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int lock (PLARGE_INTEGER timeout = NULL);
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int trylock ();
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int unlock ();
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int destroy ();
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void set_type (int in_type) {type = in_type;}
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int lock_recursive ()
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{
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if (recursion_counter == UINT_MAX)
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return EAGAIN;
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recursion_counter++;
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return 0;
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}
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bool can_be_unlocked ();
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pthread_mutex (pthread_mutexattr * = NULL);
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pthread_mutex (pthread_mutex_t *, pthread_mutexattr *);
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~pthread_mutex ();
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class pthread_mutex *next;
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static void fixup_after_fork ()
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{
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mutexes.fixup_after_fork ();
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mutexes.for_each (&pthread_mutex::_fixup_after_fork);
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}
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protected:
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LONG lock_counter;
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HANDLE win32_obj_id;
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pthread_t owner;
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#ifdef DEBUGGING
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DWORD tid; /* the thread id of the owner */
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#endif
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void set_shared (int in_shared) { pshared = in_shared; }
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void set_owner (pthread_t self)
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{
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recursion_counter = 1;
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owner = self;
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#ifdef DEBUGGING
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tid = GetCurrentThreadId ();
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#endif
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}
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static const pthread_t _new_mutex;
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static const pthread_t _unlocked_mutex;
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static const pthread_t _destroyed_mutex;
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private:
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unsigned int recursion_counter;
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LONG condwaits;
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int type;
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int pshared;
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bool no_owner ();
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void _fixup_after_fork ();
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static List<pthread_mutex> mutexes;
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static fast_mutex mutex_initialization_lock;
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friend class pthread_cond;
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};
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class pthread_spinlock: public pthread_mutex
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{
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public:
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static bool is_good_object (pthread_spinlock_t const *);
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static int init (pthread_spinlock_t *, int);
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int lock ();
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int unlock ();
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pthread_spinlock (int);
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};
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class _cygtls;
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class pthread: public verifyable_object
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{
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public:
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HANDLE win32_obj_id;
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class pthread_attr attr;
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void *(*function) (void *);
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void *arg;
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void *return_ptr;
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bool valid;
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bool suspended;
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bool canceled;
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int cancelstate, canceltype;
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_cygtls *cygtls;
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HANDLE cancel_event;
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pthread_t joiner;
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virtual bool create (void *(*)(void *), pthread_attr *, void *);
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pthread ();
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virtual ~pthread ();
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static void init_mainthread ();
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static bool is_good_object(pthread_t const *);
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static void atforkprepare();
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static void atforkparent();
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static void atforkchild();
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/* API calls */
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static int cancel (pthread_t);
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static int join (pthread_t * thread, void **return_val, PLARGE_INTEGER);
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static int detach (pthread_t * thread);
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static int create (pthread_t * thread, const pthread_attr_t * attr,
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void *(*start_routine) (void *), void *arg);
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static int once (pthread_once_t *, void (*)(void));
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static int atfork(void (*)(void), void (*)(void), void (*)(void));
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static int suspend (pthread_t * thread);
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static int resume (pthread_t * thread);
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virtual void exit (void *value_ptr) __attribute__ ((noreturn));
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virtual int cancel ();
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virtual void testcancel ();
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static HANDLE get_cancel_event ();
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static void static_cancel_self () __attribute__ ((noreturn));
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virtual int setcancelstate (int state, int *oldstate);
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virtual int setcanceltype (int type, int *oldtype);
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virtual void push_cleanup_handler (__pthread_cleanup_handler *handler);
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virtual void pop_cleanup_handler (int const execute);
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static pthread* self ();
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static DWORD thread_init_wrapper (void *);
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virtual unsigned long getsequence_np();
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static int equal (pthread_t t1, pthread_t t2)
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{
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return t1 == t2;
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}
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/* List support calls */
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class pthread *next;
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static void fixup_after_fork ()
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{
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threads.fixup_after_fork ();
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threads.for_each (&pthread::_fixup_after_fork);
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}
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static void suspend_all_except_self ()
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{
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threads.for_each (&pthread::suspend_except_self);
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}
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static void resume_all ()
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{
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threads.for_each (&pthread::resume);
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}
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private:
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static List<pthread> threads;
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DWORD thread_id;
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__pthread_cleanup_handler *cleanup_stack;
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pthread_mutex mutex;
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sigset_t parent_sigmask;
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void suspend_except_self ();
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void resume ();
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void _fixup_after_fork ();
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void pop_all_cleanup_handlers ();
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void precreate (pthread_attr *);
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void postcreate ();
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bool create_cancel_event ();
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void set_tls_self_pointer ();
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void cancel_self () __attribute__ ((noreturn));
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DWORD get_thread_id ();
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};
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class pthread_null : public pthread
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{
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public:
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static pthread *get_null_pthread();
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~pthread_null();
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/* From pthread These should never get called
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* as the ojbect is not verifyable
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*/
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bool create (void *(*)(void *), pthread_attr *, void *);
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void exit (void *value_ptr) __attribute__ ((noreturn));
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int cancel ();
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void testcancel ();
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int setcancelstate (int state, int *oldstate);
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int setcanceltype (int type, int *oldtype);
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void push_cleanup_handler (__pthread_cleanup_handler *handler);
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void pop_cleanup_handler (int const execute);
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unsigned long getsequence_np();
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private:
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pthread_null ();
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static pthread_null _instance;
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};
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class pthread_condattr: public verifyable_object
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{
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public:
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static bool is_good_object(pthread_condattr_t const *);
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int shared;
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clockid_t clock_id;
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pthread_condattr ();
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~pthread_condattr ();
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};
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class pthread_cond: public verifyable_object
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{
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public:
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static bool is_good_object (pthread_cond_t const *);
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static bool is_initializer (pthread_cond_t const *);
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static bool is_initializer_or_object (pthread_cond_t const *);
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static bool is_initializer_or_bad_object (pthread_cond_t const *);
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static void init_mutex ();
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static int init (pthread_cond_t *, const pthread_condattr_t *);
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int shared;
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clockid_t clock_id;
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LONG waiting;
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LONG pending;
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HANDLE sem_wait;
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pthread_mutex mtx_in;
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pthread_mutex mtx_out;
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pthread_mutex_t mtx_cond;
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void unblock (const bool all);
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int wait (pthread_mutex_t mutex, PLARGE_INTEGER timeout = NULL);
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pthread_cond (pthread_condattr *);
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~pthread_cond ();
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class pthread_cond * next;
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static void fixup_after_fork ()
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{
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conds.fixup_after_fork ();
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conds.for_each (&pthread_cond::_fixup_after_fork);
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}
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private:
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void _fixup_after_fork ();
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static List<pthread_cond> conds;
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static fast_mutex cond_initialization_lock;
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};
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class pthread_barrierattr: public verifyable_object
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{
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public:
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static bool is_good_object(pthread_barrierattr_t const *);
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int shared;
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pthread_barrierattr ();
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~pthread_barrierattr ();
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};
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class pthread_barrier: public verifyable_object
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{
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public:
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static bool is_good_object(pthread_barrier_t const *);
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pthread_mutex_t mtx; /* Mutex protecting everything below. */
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pthread_cond_t cond; /* Conditional variable to wait on. */
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unsigned cnt; /* Barrier count. Threads to wait for. */
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uint64_t cyc; /* Cycle count. */
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unsigned wt; /* Already waiting threads count. */
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int init (const pthread_barrierattr_t *, unsigned);
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int wait();
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int destroy ();
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|
|
|
pthread_barrier ();
|
|
~pthread_barrier ();
|
|
};
|
|
|
|
|
|
class pthread_rwlockattr: public verifyable_object
|
|
{
|
|
public:
|
|
static bool is_good_object(pthread_rwlockattr_t const *);
|
|
int shared;
|
|
|
|
pthread_rwlockattr ();
|
|
~pthread_rwlockattr ();
|
|
};
|
|
|
|
class pthread_rwlock: public verifyable_object
|
|
{
|
|
public:
|
|
static bool is_good_object (pthread_rwlock_t const *);
|
|
static bool is_initializer (pthread_rwlock_t const *);
|
|
static bool is_initializer_or_object (pthread_rwlock_t const *);
|
|
static bool is_initializer_or_bad_object (pthread_rwlock_t const *);
|
|
static void init_mutex ();
|
|
static int init (pthread_rwlock_t *, const pthread_rwlockattr_t *);
|
|
|
|
int shared;
|
|
|
|
uint32_t waiting_readers;
|
|
uint32_t waiting_writers;
|
|
pthread_t writer;
|
|
struct RWLOCK_READER
|
|
{
|
|
struct RWLOCK_READER *next;
|
|
pthread_t thread;
|
|
uint32_t n;
|
|
RWLOCK_READER (): next (NULL), thread (pthread::self ()), n (0) {}
|
|
} *readers;
|
|
fast_mutex readers_mx;
|
|
|
|
int rdlock (PLARGE_INTEGER timeout = NULL);
|
|
int tryrdlock ();
|
|
|
|
int wrlock (PLARGE_INTEGER timeout = NULL);
|
|
int trywrlock ();
|
|
|
|
int unlock ();
|
|
|
|
pthread_mutex mtx;
|
|
pthread_cond cond_readers;
|
|
pthread_cond cond_writers;
|
|
|
|
pthread_rwlock (pthread_rwlockattr *);
|
|
~pthread_rwlock ();
|
|
|
|
class pthread_rwlock * next;
|
|
static void fixup_after_fork ()
|
|
{
|
|
rwlocks.fixup_after_fork ();
|
|
rwlocks.for_each (&pthread_rwlock::_fixup_after_fork);
|
|
}
|
|
|
|
private:
|
|
static List<pthread_rwlock> rwlocks;
|
|
|
|
RWLOCK_READER *add_reader ();
|
|
void remove_reader (struct RWLOCK_READER *rd);
|
|
struct RWLOCK_READER *lookup_reader ();
|
|
|
|
void release ()
|
|
{
|
|
if (waiting_writers)
|
|
{
|
|
if (!readers)
|
|
cond_writers.unblock (false);
|
|
}
|
|
else if (waiting_readers)
|
|
cond_readers.unblock (true);
|
|
}
|
|
|
|
|
|
static void rdlock_cleanup (void *arg);
|
|
static void wrlock_cleanup (void *arg);
|
|
|
|
void _fixup_after_fork ();
|
|
|
|
static fast_mutex rwlock_initialization_lock;
|
|
};
|
|
|
|
class pthread_once
|
|
{
|
|
public:
|
|
pthread_mutex_t mutex;
|
|
volatile int state;
|
|
};
|
|
|
|
/* shouldn't be here */
|
|
class semaphore: public verifyable_object
|
|
{
|
|
public:
|
|
static bool is_good_object(sem_t const *);
|
|
/* API calls */
|
|
static int init (sem_t *sem, int pshared, unsigned int value);
|
|
static int destroy (sem_t *sem);
|
|
static sem_t *open (unsigned long long hash, LUID luid, int fd, int oflag,
|
|
mode_t mode, unsigned int value, bool &wasopen);
|
|
static int close (sem_t *sem);
|
|
static int wait (sem_t *sem);
|
|
static int post (sem_t *sem);
|
|
static int getvalue (sem_t *sem, int *sval);
|
|
static int trywait (sem_t *sem);
|
|
static int clockwait (sem_t *sem, clockid_t clock_id,
|
|
const struct timespec *abstime);
|
|
|
|
static int getinternal (sem_t *sem, int *sfd, unsigned long long *shash,
|
|
LUID *sluid, unsigned int *sval);
|
|
|
|
HANDLE win32_obj_id;
|
|
int shared;
|
|
LONG currentvalue;
|
|
LONG startvalue;
|
|
int fd;
|
|
unsigned long long hash;
|
|
LUID luid;
|
|
sem_t *sem;
|
|
|
|
semaphore (int, unsigned int);
|
|
semaphore (unsigned long long, LUID, int, sem_t *, int, mode_t, unsigned int);
|
|
~semaphore ();
|
|
|
|
class semaphore * next;
|
|
static void fixup_before_fork ()
|
|
{
|
|
semaphores.for_each (&semaphore::_fixup_before_fork);
|
|
}
|
|
static void fixup_after_fork ()
|
|
{
|
|
semaphores.fixup_after_fork ();
|
|
semaphores.for_each (&semaphore::_fixup_after_fork);
|
|
}
|
|
static void terminate ()
|
|
{
|
|
save_errno save;
|
|
semaphores.for_each (&semaphore::_terminate);
|
|
}
|
|
|
|
private:
|
|
void _post ();
|
|
int _getvalue (int *sval);
|
|
int _trywait ();
|
|
int _wait (PLARGE_INTEGER timeout = NULL);
|
|
|
|
void _fixup_before_fork ();
|
|
void _fixup_after_fork ();
|
|
void _terminate ();
|
|
|
|
static List<semaphore> semaphores;
|
|
};
|
|
|
|
class callback
|
|
{
|
|
public:
|
|
void (*cb)(void);
|
|
class callback * next;
|
|
};
|
|
|
|
struct MTinterface
|
|
{
|
|
// General
|
|
int concurrency;
|
|
LONG threadcount;
|
|
|
|
callback *pthread_prepare;
|
|
callback *pthread_child;
|
|
callback *pthread_parent;
|
|
|
|
void Init ();
|
|
void fixup_before_fork ();
|
|
void fixup_after_fork ();
|
|
|
|
#if 0 // avoid initialization since zero is implied and
|
|
MTinterface () :
|
|
concurrency (0), threadcount (0),
|
|
pthread_prepare (NULL), pthread_child (NULL), pthread_parent (NULL)
|
|
{
|
|
}
|
|
#endif
|
|
};
|
|
|
|
#define MT_INTERFACE user_data->threadinterface
|