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d0bd3e6f56
* libc/include/sys/_types.h: Include <sys/lock.h> and change
_flock_t to be of type _LOCK_RECURSIVE_T.
* libc/include/sys/reent.h: (_REENT_INIT): Reformat.
(_REENT_INIT_PTR): Ditto. Use memset where appropriate.
(_global_impure_ptr): New declaration.
(_GLOBAL_REENT): Change to be _global_impure_ptr.
* libc/include/sys/stdio.h: Include <sys/lock.h> and
<sys/reent.h>.
(_flockfile)[!_SINGLE_THREAD]: Add code for lock call.
(_funlockfile)[!SINGLE_THREAD]: Ditto.
* libc/reent/impure.c: Set _global_impure_ptr to _impure_ptr.
* libc/stdio/fclose.c: Remove casting of fp lock to
_LOCK_RECURSIVE_T.
* libc/stdio/findfp.c: Ditto.
* libc/stdio/fopen.c: Ditto.
* libc/stdio/freopen.c: Ditto.
* libc/stdio/vfprintf.c: Ditto.
* libc/stdio64/fopen64.c: Ditto.
* libc/stdlib/envlock.c: Add default stubs that use generic
locking code.
* libc/stdlib/mlock.c: Ditto.
Jeff Johnston <jjohnstn@redhat.com>
* libc/sys/linux/sys/_types.h (__flock_mutex_t): New subtype.
(_flock_t): Change to be a struct containing a single member
named mutex which is of type __flock_mutex_t.
62 lines
1.5 KiB
C
62 lines
1.5 KiB
C
/*
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FUNCTION
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<<__env_lock>>, <<__env_unlock>>--lock environ variable
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INDEX
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__env_lock
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INDEX
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__env_unlock
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ANSI_SYNOPSIS
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#include "envlock.h"
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void __env_lock (struct _reent *<[reent]>);
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void __env_unlock (struct _reent *<[reent]>);
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TRAD_SYNOPSIS
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void __env_lock(<[reent]>)
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struct _reent *<[reent]>;
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void __env_unlock(<[reent]>)
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struct _reent *<[reent]>;
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DESCRIPTION
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The <<setenv>> family of routines call these functions when they need to
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modify the environ variable. The version of these routines supplied in the
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library use the lock API defined in sys/lock.h. If multiple threads of
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execution can call <<setenv>>, or if <<setenv>> can be called reentrantly,
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then you need to define your own versions of these functions in order to
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safely lock the memory pool during a call. If you do not, the memory pool
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may become corrupted.
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A call to <<setenv>> may call <<__env_lock>> recursively; that is,
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the sequence of calls may go <<__env_lock>>, <<__env_lock>>,
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<<__env_unlock>>, <<__env_unlock>>. Any implementation of these
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routines must be careful to avoid causing a thread to wait for a lock
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that it already holds.
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*/
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#include "envlock.h"
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#include <sys/lock.h>
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#ifndef __SINGLE_THREAD__
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__LOCK_INIT_RECURSIVE(static, __env_lock_object);
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#endif
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void
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__env_lock (ptr)
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struct _reent *ptr;
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{
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#ifndef __SINGLE_THREAD__
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__lock_acquire_recursive (__env_lock_object);
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#endif
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}
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void
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__env_unlock (ptr)
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struct _reent *ptr;
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{
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#ifndef __SINGLE_THREAD__
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__lock_release_recursive (__env_lock_object);
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#endif
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}
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