2 * mono-semaphore.c: mono-semaphore functions
5 * Gonzalo Paniagua Javier <gonzalo@novell.com>
7 * (C) 2010 Novell, Inc.
12 #include "utils/mono-semaphore.h"
13 #ifdef HAVE_SYS_TIME_H
20 #if (defined (HAVE_SEMAPHORE_H) || defined (USE_MACH_SEMA)) && !defined(HOST_WIN32)
21 /* sem_* or semaphore_* functions in use */
23 # define TIMESPEC mach_timespec_t
24 # define WAIT_BLOCK(a,b) semaphore_timedwait (*(a), *(b))
25 # elif defined(__native_client__) && defined(USE_NEWLIB)
26 # define TIMESPEC struct timespec
27 # define WAIT_BLOCK(a, b) sem_trywait(a)
29 # define TIMESPEC struct timespec
30 # define WAIT_BLOCK(a,b) sem_timedwait (a, b)
34 #define NSEC_PER_SEC 1000000000
38 mono_sem_timedwait (MonoSemType *sem, guint32 timeout_ms, gboolean alertable)
46 return sem_trywait (sem);
48 if (timeout_ms == (guint32) 0xFFFFFFFF)
49 return mono_sem_wait (sem, alertable);
52 memset (&t, 0, sizeof (t));
54 gettimeofday (&t, NULL);
56 ts.tv_sec = timeout_ms / 1000 + t.tv_sec;
57 ts.tv_nsec = (timeout_ms % 1000) * 1000000 + t.tv_usec * 1000;
58 while (ts.tv_nsec > NSEC_PER_SEC) {
59 ts.tv_nsec -= NSEC_PER_SEC;
64 while ((res = WAIT_BLOCK (sem, &ts)) == -1 && errno == EINTR) {
65 struct timeval current;
69 memset (¤t, 0, sizeof (current));
71 gettimeofday (¤t, NULL);
74 ts.tv_sec -= (current.tv_sec - t.tv_sec);
75 ts.tv_nsec -= (current.tv_usec - t.tv_usec) * 1000;
81 ts.tv_nsec += NSEC_PER_SEC;
90 /* OSX might return > 0 for error */
97 mono_sem_wait (MonoSemType *sem, gboolean alertable)
100 #ifndef USE_MACH_SEMA
101 while ((res = sem_wait (sem)) == -1 && errno == EINTR)
103 while ((res = semaphore_wait (*sem)) == KERN_ABORTED)
109 /* OSX might return > 0 for error */
116 mono_sem_post (MonoSemType *sem)
119 #ifndef USE_MACH_SEMA
120 while ((res = sem_post (sem)) == -1 && errno == EINTR);
122 res = semaphore_signal (*sem);
123 /* OSX might return > 0 for error */
124 if (res != KERN_SUCCESS)
131 /* Windows or io-layer functions in use */
133 mono_sem_wait (MonoSemType *sem, gboolean alertable)
135 return mono_sem_timedwait (sem, INFINITE, alertable);
139 mono_sem_timedwait (MonoSemType *sem, guint32 timeout_ms, gboolean alertable)
143 while ((res = WaitForSingleObjectEx (*sem, timeout_ms, alertable)) == WAIT_IO_COMPLETION) {
152 // WAIT_TIMEOUT and WAIT_FAILED
159 mono_sem_post (MonoSemType *sem)
161 if (!ReleaseSemaphore (*sem, 1, NULL))