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/*
* mono-semaphore.c: mono-semaphore functions
*
* Author:
* Gonzalo Paniagua Javier <gonzalo@novell.com>
*
* (C) 2010 Novell, Inc.
*/
#include <config.h>
#include <errno.h>
#include "utils/mono-semaphore.h"
#ifdef HAVE_SYS_TIME_H
#include <sys/time.h>
#endif
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#if (defined (HAVE_SEMAPHORE_H) || defined (USE_MACH_SEMA)) && !defined(HOST_WIN32)
/* sem_* or semaphore_* functions in use */
# ifdef USE_MACH_SEMA
# define TIMESPEC mach_timespec_t
# define WAIT_BLOCK(a,b) semaphore_timedwait (*(a), *(b))
# elif defined(__native_client__) && defined(USE_NEWLIB)
# define TIMESPEC struct timespec
# define WAIT_BLOCK(a, b) sem_trywait(a)
# elif defined(__OpenBSD__)
# define TIMESPEC struct timespec
# define WAIT_BLOCK(a) sem_trywait(a)
# else
# define TIMESPEC struct timespec
# define WAIT_BLOCK(a,b) sem_timedwait (a, b)
# endif
#define NSEC_PER_SEC 1000000000
int
mono_sem_timedwait (MonoSemType *sem, guint32 timeout_ms, gboolean alertable)
{
TIMESPEC ts, copy;
struct timeval t;
int res = 0;
#if defined(__OpenBSD__)
int timeout;
#endif
#ifndef USE_MACH_SEMA
if (timeout_ms == 0)
return sem_trywait (sem);
#endif
if (timeout_ms == (guint32) 0xFFFFFFFF)
return mono_sem_wait (sem, alertable);
#ifdef USE_MACH_SEMA
memset (&t, 0, sizeof (TIMESPEC));
#else
gettimeofday (&t, NULL);
#endif
ts.tv_sec = timeout_ms / 1000 + t.tv_sec;
ts.tv_nsec = (timeout_ms % 1000) * 1000000 + t.tv_usec * 1000;
while (ts.tv_nsec > NSEC_PER_SEC) {
ts.tv_nsec -= NSEC_PER_SEC;
ts.tv_sec++;
}
#if defined(__OpenBSD__)
timeout = ts.tv_sec;
while (timeout) {
if ((res = WAIT_BLOCK (sem)) == 0)
return res;
if (alertable)
return -1;
usleep (ts.tv_nsec / 1000);
timeout--;
}
#else
copy = ts;
while ((res = WAIT_BLOCK (sem, &ts)) == -1 && errno == EINTR) {
struct timeval current;
if (alertable)
return -1;
#ifdef USE_MACH_SEMA
memset (¤t, 0, sizeof (TIMESPEC));
#else
gettimeofday (¤t, NULL);
#endif
ts = copy;
ts.tv_sec -= (current.tv_sec - t.tv_sec);
ts.tv_nsec -= (current.tv_usec - t.tv_usec) * 1000;
if (ts.tv_nsec < 0) {
if (ts.tv_sec <= 0) {
ts.tv_nsec = 0;
} else {
ts.tv_sec--;
ts.tv_nsec += NSEC_PER_SEC;
}
}
if (ts.tv_sec < 0) {
ts.tv_sec = 0;
ts.tv_nsec = 0;
}
}
#endif
/* OSX might return > 0 for error */
if (res != 0)
res = -1;
return res;
}
int
mono_sem_wait (MonoSemType *sem, gboolean alertable)
{
int res;
#ifndef USE_MACH_SEMA
while ((res = sem_wait (sem)) == -1 && errno == EINTR)
#else
while ((res = semaphore_wait (*sem)) == KERN_ABORTED)
#endif
{
if (alertable)
return -1;
}
/* OSX might return > 0 for error */
if (res != 0)
res = -1;
return res;
}
int
mono_sem_post (MonoSemType *sem)
{
int res;
#ifndef USE_MACH_SEMA
while ((res = sem_post (sem)) == -1 && errno == EINTR);
#else
res = semaphore_signal (*sem);
/* OSX might return > 0 for error */
if (res != KERN_SUCCESS)
res = -1;
#endif
return res;
}
#else
/* Windows or io-layer functions in use */
int
mono_sem_wait (MonoSemType *sem, gboolean alertable)
{
return mono_sem_timedwait (sem, INFINITE, alertable);
}
int
mono_sem_timedwait (MonoSemType *sem, guint32 timeout_ms, gboolean alertable)
{
gboolean res;
while ((res = WaitForSingleObjectEx (*sem, timeout_ms, alertable)) == WAIT_IO_COMPLETION) {
if (alertable) {
errno = EINTR;
return -1;
}
}
switch (res) {
case WAIT_OBJECT_0:
return 0;
// WAIT_TIMEOUT and WAIT_FAILED
default:
return -1;
}
}
int
mono_sem_post (MonoSemType *sem)
{
if (!ReleaseSemaphore (*sem, 1, NULL))
return -1;
return 0;
}
#endif
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