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https://github.com/radareorg/radare2.git
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75 lines
1.7 KiB
C
75 lines
1.7 KiB
C
/* radare - LGPL - Copyright 2009-2017 - pancake */
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#include <r_th.h>
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/* locks/mutex/sems */
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R_API RThreadLock *r_th_lock_new(bool recursive) {
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RThreadLock *thl = R_NEW0 (RThreadLock);
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if (thl) {
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// TODO: thl->refs is inconsistently guarded by mutexes and could race
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thl->refs = 0;
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#if HAVE_PTHREAD
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if (recursive) {
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pthread_mutexattr_t attr;
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pthread_mutexattr_init (&attr);
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#if !defined(__GLIBC__) || __USE_UNIX98__
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pthread_mutexattr_settype (&attr, PTHREAD_MUTEX_RECURSIVE);
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#else
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pthread_mutexattr_settype (&attr, PTHREAD_MUTEX_RECURSIVE_NP);
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#endif
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pthread_mutex_init (&thl->lock, &attr);
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} else {
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pthread_mutex_init (&thl->lock, NULL);
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}
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#elif __WINDOWS__ && !defined(__CYGWIN__)
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// TODO: obey `recursive` (currently it is always recursive)
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InitializeCriticalSection (&thl->lock);
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#endif
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}
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return thl;
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}
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R_API int r_th_lock_wait(RThreadLock *thl) {
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r_th_lock_enter (thl); // locks here
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r_th_lock_leave (thl); // releases previous mutex
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return 0;
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}
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R_API int r_th_lock_enter(RThreadLock *thl) {
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#if HAVE_PTHREAD
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pthread_mutex_lock (&thl->lock);
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#elif __WINDOWS__ && !defined(__CYGWIN__)
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EnterCriticalSection (&thl->lock);
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#endif
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return ++thl->refs;
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}
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R_API int r_th_lock_leave(RThreadLock *thl) {
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#if HAVE_PTHREAD
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pthread_mutex_unlock (&thl->lock);
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#elif __WINDOWS__ && !defined(__CYGWIN__)
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LeaveCriticalSection (&thl->lock);
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#endif
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if (thl->refs > 0) {
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thl->refs--;
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}
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return thl->refs;
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}
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R_API int r_th_lock_check(RThreadLock *thl) {
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return thl->refs;
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}
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R_API void *r_th_lock_free(RThreadLock *thl) {
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if (thl) {
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#if HAVE_PTHREAD
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pthread_mutex_destroy (&thl->lock);
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#elif __WINDOWS__ && !defined(__CYGWIN__)
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DeleteCriticalSection (&thl->lock);
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#endif
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free (thl);
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}
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return NULL;
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}
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