616 lines
15 KiB
C++
616 lines
15 KiB
C++
/* thread.h: Locking and threading module definitions
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Copyright 1998, 1999, 2000, 2001, 2002 Red Hat, Inc.
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Written by Marco Fuykschot <marco@ddi.nl>
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Major update 2001 Robert Collins <rbtcollins@hotmail.com>
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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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#ifndef _CYGNUS_THREADS_
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#define _CYGNUS_THREADS_
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#define LOCK_FD_LIST 1
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#define LOCK_MEMORY_LIST 2
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#define LOCK_MMAP_LIST 3
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#define LOCK_DLL_LIST 4
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#define WRITE_LOCK 1
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#define READ_LOCK 2
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extern "C"
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{
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#if defined (_CYG_THREAD_FAILSAFE) && defined (_MT_SAFE)
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void AssertResourceOwner (int, int);
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#else
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#define AssertResourceOwner(i,ii)
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#endif
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}
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#ifndef _MT_SAFE
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#define SetResourceLock(i,n,c)
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#define ReleaseResourceLock(i,n,c)
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#else
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#include <pthread.h>
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#include <signal.h>
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#include <pwd.h>
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#include <grp.h>
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#define _NOMNTENT_FUNCS
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#include <mntent.h>
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extern "C"
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{
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struct _winsup_t
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{
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/*
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Needed for the group functions
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*/
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struct __group16 _grp;
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char *_namearray[2];
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int _grp_pos;
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/* console.cc */
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unsigned _rarg;
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/* dlfcn.cc */
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int _dl_error;
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char _dl_buffer[256];
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/* passwd.cc */
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struct passwd _res;
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char _pass[_PASSWORD_LEN];
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int _pw_pos;
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/* path.cc */
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struct mntent mntbuf;
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int _iteration;
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DWORD available_drives;
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char mnt_type[80];
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char mnt_opts[80];
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char mnt_fsname[MAX_PATH];
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char mnt_dir[MAX_PATH];
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/* strerror */
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char _strerror_buf[20];
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/* sysloc.cc */
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char *_process_ident;
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int _process_logopt;
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int _process_facility;
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int _process_logmask;
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/* times.cc */
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char timezone_buf[20];
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struct tm _localtime_buf;
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/* uinfo.cc */
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char _username[UNLEN + 1];
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/* net.cc */
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char *_ntoa_buf;
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struct protoent *_protoent_buf;
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struct servent *_servent_buf;
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struct hostent *_hostent_buf;
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};
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struct __reent_t
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{
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struct _reent *_clib;
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struct _winsup_t *_winsup;
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};
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_reent *_reent_clib ();
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_winsup_t *_reent_winsup ();
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void SetResourceLock (int, int, const char *) __attribute__ ((regparm (3)));
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void ReleaseResourceLock (int, int, const char *)
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__attribute__ ((regparm (3)));
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#ifdef _CYG_THREAD_FAILSAFE
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void AssertResourceOwner (int, int);
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#else
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#define AssertResourceOwner(i,ii)
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#endif
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}
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class per_process;
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class pinfo;
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class ResourceLocks
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{
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public:
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ResourceLocks ()
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{
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}
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LPCRITICAL_SECTION Lock (int);
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void Init ();
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void Delete ();
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#ifdef _CYG_THREAD_FAILSAFE
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DWORD owner;
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DWORD count;
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#endif
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private:
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CRITICAL_SECTION lock;
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bool inited;
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};
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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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/* 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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long magic;
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verifyable_object (long);
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virtual ~verifyable_object ();
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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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verifyable_object_state verifyable_object_isvalid (void const *, long);
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verifyable_object_state verifyable_object_isvalid (void const *, long, void *);
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/* interface */
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template <class ListNode> class List {
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public:
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List();
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void Insert (ListNode *aNode);
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ListNode *Remove ( ListNode *aNode);
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ListNode *Pop ();
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void forEach (void (*)(ListNode *aNode));
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protected:
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ListNode *head;
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};
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class pthread_key:public verifyable_object
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{
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public:
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static bool isGoodObject (pthread_key_t const *);
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static void runAllDestructors ();
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DWORD dwTlsIndex;
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int set (const void *);
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void *get () const;
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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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static void fixup_after_fork();
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/* List support calls */
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class pthread_key *next;
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private:
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// lists of objects. USE THREADSAFE INSERTS AND DELETES.
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static List<pthread_key> keys;
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static void saveAKey (pthread_key *);
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static void restoreAKey (pthread_key *);
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static void destroyAKey (pthread_key *);
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void saveKeyToBuffer ();
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void recreateKeyFromBuffer ();
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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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/* implementation */
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template <class ListNode>
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List<ListNode>::List<ListNode> () : head(NULL)
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{
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}
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template <class ListNode> void
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List<ListNode>::Insert (ListNode *aNode)
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{
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if (!aNode)
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return;
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aNode->next = (ListNode *) InterlockedExchangePointer (&head, aNode);
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}
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template <class ListNode> ListNode *
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List<ListNode>::Remove ( ListNode *aNode)
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{
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if (!aNode)
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return NULL;
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if (!head)
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return NULL;
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if (aNode == head)
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return Pop ();
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ListNode *resultPrev = head;
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while (resultPrev && resultPrev->next && !(aNode == resultPrev->next))
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resultPrev = resultPrev->next;
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if (resultPrev)
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return (ListNode *)InterlockedExchangePointer (&resultPrev->next, resultPrev->next->next);
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return NULL;
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}
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template <class ListNode> ListNode *
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List<ListNode>::Pop ()
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{
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return (ListNode *) InterlockedExchangePointer (&head, head->next);
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}
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/* poor mans generic programming. */
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template <class ListNode> void
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List<ListNode>::forEach (void (*callback)(ListNode *))
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{
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ListNode *aNode = head;
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while (aNode)
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{
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callback (aNode);
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aNode = aNode->next;
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}
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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 isGoodObject(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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size_t stacksize;
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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 isGoodObject(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 bool isGoodObject(pthread_mutex_t const *);
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static bool isGoodInitializer(pthread_mutex_t const *);
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static bool isGoodInitializerOrObject(pthread_mutex_t const *);
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static bool isGoodInitializerOrBadObject (pthread_mutex_t const *mutex);
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static void initMutex ();
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static int init (pthread_mutex_t *, const pthread_mutexattr_t *);
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CRITICAL_SECTION criticalsection;
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HANDLE win32_obj_id;
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LONG condwaits;
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int pshared;
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class pthread_mutex * next;
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int Lock ();
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int TryLock ();
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int UnLock ();
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void fixup_after_fork ();
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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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private:
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class nativeMutex {
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public:
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bool init();
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bool lock();
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void unlock();
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private:
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HANDLE theHandle;
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};
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static nativeMutex mutexInitializationLock;
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};
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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 suspended;
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int cancelstate, canceltype;
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HANDLE cancel_event;
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pthread_t joiner;
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// int joinable;
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/* signal handling */
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struct sigaction *sigs;
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sigset_t *sigmask;
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LONG *sigtodo;
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virtual void create (void *(*)(void *), pthread_attr *, void *);
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pthread ();
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virtual ~pthread ();
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static void initMainThread (bool);
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static bool isGoodObject(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);
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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);
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virtual int cancel ();
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virtual void testcancel ();
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static void static_cancel_self ();
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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 void *thread_init_wrapper (void *);
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virtual unsigned long getsequence_np();
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private:
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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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void pop_all_cleanup_handlers (void);
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void precreate (pthread_attr *);
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void postcreate ();
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void setThreadIdtoCurrent ();
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static void setTlsSelfPointer (pthread *);
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static pthread *getTlsSelfPointer ();
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void cancel_self ();
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DWORD getThreadId ();
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void initCurrentThread ();
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};
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class pthreadNull : public pthread
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{
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public:
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static pthread *getNullpthread();
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~pthreadNull();
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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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void create (void *(*)(void *), pthread_attr *, void *);
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void exit (void *value_ptr);
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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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pthreadNull ();
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static pthreadNull _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 isGoodObject(pthread_condattr_t const *);
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int shared;
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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 isGoodObject(pthread_cond_t const *);
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static bool isGoodInitializer(pthread_cond_t const *);
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static bool isGoodInitializerOrObject(pthread_cond_t const *);
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int shared;
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LONG waiting;
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LONG ExitingWait;
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pthread_mutex *mutex;
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/* to allow atomic behaviour for cond_broadcast */
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pthread_mutex_t cond_access;
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HANDLE win32_obj_id;
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class pthread_cond * next;
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int TimedWait (DWORD dwMilliseconds);
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void BroadCast ();
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void Signal ();
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void fixup_after_fork ();
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pthread_cond (pthread_condattr *);
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~pthread_cond ();
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};
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class pthread_once
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{
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public:
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pthread_mutex_t mutex;
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int state;
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};
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/* shouldn't be here */
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class semaphore:public verifyable_object
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{
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public:
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static bool isGoodObject(sem_t const *);
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/* API calls */
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static int init (sem_t * sem, int pshared, unsigned int value);
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static int destroy (sem_t * sem);
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static int wait (sem_t * sem);
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static int trywait (sem_t * sem);
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static int post (sem_t * sem);
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HANDLE win32_obj_id;
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class semaphore * next;
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int shared;
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long currentvalue;
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void Wait ();
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void Post ();
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int TryWait ();
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void fixup_after_fork ();
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semaphore (int, unsigned int);
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~semaphore ();
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};
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class callback
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{
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public:
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void (*cb)(void);
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class callback * next;
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};
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class MTinterface
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{
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public:
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// General
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int concurrency;
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long int threadcount;
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// Used for main thread data, and sigproc thread
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struct __reent_t reents;
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struct _winsup_t winsup_reent;
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callback *pthread_prepare;
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callback *pthread_child;
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callback *pthread_parent;
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// lists of pthread objects. USE THREADSAFE INSERTS AND DELETES.
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class pthread_mutex * mutexs;
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class pthread_cond * conds;
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class semaphore * semaphores;
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pthread_key reent_key;
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pthread_key thread_self_key;
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void Init (int);
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void fixup_before_fork (void);
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void fixup_after_fork (void);
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MTinterface () :
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concurrency (0), threadcount (1),
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pthread_prepare (NULL), pthread_child (NULL), pthread_parent (NULL),
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mutexs (NULL), conds (NULL), semaphores (NULL),
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reent_key (NULL), thread_self_key (NULL)
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{
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}
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};
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#define MT_INTERFACE user_data->threadinterface
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extern "C"
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{
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int __pthread_attr_init (pthread_attr_t * attr);
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int __pthread_attr_destroy (pthread_attr_t * attr);
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int __pthread_attr_setdetachstate (pthread_attr_t *, int);
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int __pthread_attr_getdetachstate (const pthread_attr_t *, int *);
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int __pthread_attr_setstacksize (pthread_attr_t * attr, size_t size);
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int __pthread_attr_getstacksize (const pthread_attr_t * attr, size_t * size);
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int __pthread_attr_getinheritsched (const pthread_attr_t *, int *);
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int __pthread_attr_getschedparam (const pthread_attr_t *,
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struct sched_param *);
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int __pthread_attr_getschedpolicy (const pthread_attr_t *, int *);
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int __pthread_attr_getscope (const pthread_attr_t *, int *);
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int __pthread_attr_getstackaddr (const pthread_attr_t *, void **);
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int __pthread_attr_setinheritsched (pthread_attr_t *, int);
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int __pthread_attr_setschedparam (pthread_attr_t *,
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const struct sched_param *);
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int __pthread_attr_setschedpolicy (pthread_attr_t *, int);
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int __pthread_attr_setscope (pthread_attr_t *, int);
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int __pthread_attr_setstackaddr (pthread_attr_t *, void *);
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/* Thread SpecificData */
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int __pthread_key_create (pthread_key_t * key, void (*destructor) (void *));
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int __pthread_key_delete (pthread_key_t key);
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int __pthread_setspecific (pthread_key_t key, const void *value);
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void *__pthread_getspecific (pthread_key_t key);
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/* Thead synchroniation */
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int __pthread_cond_destroy (pthread_cond_t * cond);
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int __pthread_cond_init (pthread_cond_t * cond,
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const pthread_condattr_t * attr);
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int __pthread_cond_signal (pthread_cond_t * cond);
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int __pthread_cond_broadcast (pthread_cond_t * cond);
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int __pthread_condattr_init (pthread_condattr_t * condattr);
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int __pthread_condattr_destroy (pthread_condattr_t * condattr);
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int __pthread_condattr_getpshared (const pthread_condattr_t * attr,
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int *pshared);
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int __pthread_condattr_setpshared (pthread_condattr_t * attr, int pshared);
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/* Thread signal */
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int __pthread_kill (pthread_t thread, int sig);
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int __pthread_sigmask (int operation, const sigset_t * set,
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sigset_t * old_set);
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/* ID */
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int __pthread_equal (pthread_t * t1, pthread_t * t2);
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/* Mutexes */
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int __pthread_mutex_lock (pthread_mutex_t *);
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int __pthread_mutex_trylock (pthread_mutex_t *);
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int __pthread_mutex_unlock (pthread_mutex_t *);
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int __pthread_mutex_destroy (pthread_mutex_t *);
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int __pthread_mutex_setprioceiling (pthread_mutex_t * mutex,
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int prioceiling, int *old_ceiling);
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int __pthread_mutex_getprioceiling (const pthread_mutex_t * mutex,
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int *prioceiling);
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int __pthread_mutexattr_destroy (pthread_mutexattr_t *);
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int __pthread_mutexattr_getprioceiling (const pthread_mutexattr_t *, int *);
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int __pthread_mutexattr_getprotocol (const pthread_mutexattr_t *, int *);
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int __pthread_mutexattr_getpshared (const pthread_mutexattr_t *, int *);
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int __pthread_mutexattr_gettype (const pthread_mutexattr_t *, int *);
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int __pthread_mutexattr_init (pthread_mutexattr_t *);
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int __pthread_mutexattr_setprioceiling (pthread_mutexattr_t *, int);
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int __pthread_mutexattr_setprotocol (pthread_mutexattr_t *, int);
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int __pthread_mutexattr_setpshared (pthread_mutexattr_t *, int);
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int __pthread_mutexattr_settype (pthread_mutexattr_t *, int);
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/* Scheduling */
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int __pthread_getconcurrency (void);
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int __pthread_setconcurrency (int new_level);
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int __pthread_getschedparam (pthread_t thread, int *policy,
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struct sched_param *param);
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int __pthread_setschedparam (pthread_t thread, int policy,
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const struct sched_param *param);
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};
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#endif // MT_SAFE
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#endif // _CYGNUS_THREADS_
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