/**
* @file
*
- * Thread, mutex, condition var and thread-specific data functions.
+ * Thread, mutex, condition variable, barrier, semaphore and
+ * thread-specific data functions.
*/
#include "util/u_debug.h" /* for assert */
-#if defined(PIPE_OS_LINUX) || defined(PIPE_OS_BSD) || defined(PIPE_OS_SOLARIS) || defined(PIPE_OS_APPLE) || defined(PIPE_OS_HAIKU)
+#if defined(PIPE_OS_LINUX) || defined(PIPE_OS_BSD) || defined(PIPE_OS_SOLARIS) || defined(PIPE_OS_APPLE) || defined(PIPE_OS_HAIKU) || defined(PIPE_OS_CYGWIN)
#include <pthread.h> /* POSIX threads headers */
#include <stdio.h> /* for perror() */
-#define PIPE_THREAD_HAVE_CONDVAR
+/* pipe_thread
+ */
typedef pthread_t pipe_thread;
#define PIPE_THREAD_ROUTINE( name, param ) \
static INLINE pipe_thread pipe_thread_create( void *(* routine)( void *), void *param )
{
pipe_thread thread;
- if (pthread_create( &thread, NULL, routine, param ))
+ sigset_t saved_set, new_set;
+ int ret;
+
+ sigfillset(&new_set);
+ pthread_sigmask(SIG_SETMASK, &new_set, &saved_set);
+ ret = pthread_create( &thread, NULL, routine, param );
+ pthread_sigmask(SIG_SETMASK, &saved_set, NULL);
+ if (ret)
return 0;
return thread;
}
return pthread_detach( thread );
}
+
+/* pipe_mutex
+ */
typedef pthread_mutex_t pipe_mutex;
-typedef pthread_cond_t pipe_condvar;
#define pipe_static_mutex(mutex) \
static pipe_mutex mutex = PTHREAD_MUTEX_INITIALIZER
#define pipe_mutex_unlock(mutex) \
(void) pthread_mutex_unlock(&(mutex))
+
+/* pipe_condvar
+ */
+typedef pthread_cond_t pipe_condvar;
+
#define pipe_static_condvar(mutex) \
static pipe_condvar mutex = PTHREAD_COND_INITIALIZER
pthread_cond_broadcast(&(cond))
+
#elif defined(PIPE_SUBSYSTEM_WINDOWS_USER)
#include <windows.h>
+/* pipe_thread
+ */
typedef HANDLE pipe_thread;
#define PIPE_THREAD_ROUTINE( name, param ) \
return -1;
}
+
+/* pipe_mutex
+ */
typedef CRITICAL_SECTION pipe_mutex;
+/* http://locklessinc.com/articles/pthreads_on_windows/ */
#define pipe_static_mutex(mutex) \
- /*static*/ pipe_mutex mutex = {0,0,0,0,0,0}
+ static pipe_mutex mutex = {(PCRITICAL_SECTION_DEBUG)-1, -1, 0, 0, 0, 0}
#define pipe_mutex_init(mutex) \
InitializeCriticalSection(&mutex)
#define pipe_mutex_unlock(mutex) \
LeaveCriticalSection(&mutex)
-/* XXX: dummy definitions, make it compile */
+/* TODO: Need a macro to declare "I don't care about WinXP compatibilty" */
+#if 0 && defined (_WIN32_WINNT) && (_WIN32_WINNT >= 0x0600)
+/* CONDITION_VARIABLE is only available on newer versions of Windows
+ * (Server 2008/Vista or later).
+ * http://msdn.microsoft.com/en-us/library/ms682052(VS.85).aspx
+ *
+ * pipe_condvar
+ */
+typedef CONDITION_VARIABLE pipe_condvar;
+
+#define pipe_static_condvar(cond) \
+ /*static*/ pipe_condvar cond = CONDITION_VARIABLE_INIT
-typedef unsigned pipe_condvar;
+#define pipe_condvar_init(cond) \
+ InitializeConditionVariable(&(cond))
-#define pipe_condvar_init(condvar) \
- (void) condvar
+#define pipe_condvar_destroy(cond) \
+ (void) cond /* nothing to do */
-#define pipe_condvar_broadcast(condvar) \
- (void) condvar
+#define pipe_condvar_wait(cond, mutex) \
+ SleepConditionVariableCS(&(cond), &(mutex), INFINITE)
+
+#define pipe_condvar_signal(cond) \
+ WakeConditionVariable(&(cond))
+
+#define pipe_condvar_broadcast(cond) \
+ WakeAllConditionVariable(&(cond))
+
+#else /* need compatibility with pre-Vista Win32 */
+
+/* pipe_condvar (XXX FIX THIS)
+ * See http://www.cs.wustl.edu/~schmidt/win32-cv-1.html
+ * for potential pitfalls in implementation.
+ */
+typedef DWORD pipe_condvar;
+
+#define pipe_static_condvar(cond) \
+ /*static*/ pipe_condvar cond = 1
+
+#define pipe_condvar_init(cond) \
+ (void) (cond = 1)
+
+#define pipe_condvar_destroy(cond) \
+ (void) cond
+
+/* Poor man's pthread_cond_wait():
+ Just release the mutex and sleep for one millisecond.
+ The caller's while() loop does all the work. */
+#define pipe_condvar_wait(cond, mutex) \
+ do { pipe_mutex_unlock(mutex); \
+ Sleep(cond); \
+ pipe_mutex_lock(mutex); \
+ } while (0)
+
+#define pipe_condvar_signal(cond) \
+ (void) cond
+
+#define pipe_condvar_broadcast(cond) \
+ (void) cond
+
+#endif /* pre-Vista win32 */
#else
+#include "os/os_time.h"
+
/** Dummy definitions */
typedef unsigned pipe_thread;
}
typedef unsigned pipe_mutex;
-typedef unsigned pipe_condvar;
#define pipe_static_mutex(mutex) \
static pipe_mutex mutex = 0
#define pipe_mutex_unlock(mutex) \
(void) mutex
+typedef int64_t pipe_condvar;
+
#define pipe_static_condvar(condvar) \
- static unsigned condvar = 0
+ static pipe_condvar condvar = 1000
#define pipe_condvar_init(condvar) \
- (void) condvar
+ (void) (condvar = 1000)
#define pipe_condvar_destroy(condvar) \
(void) condvar
+/* Poor man's pthread_cond_wait():
+ Just release the mutex and sleep for one millisecond.
+ The caller's while() loop does all the work. */
#define pipe_condvar_wait(condvar, mutex) \
- (void) condvar
+ do { pipe_mutex_unlock(mutex); \
+ os_time_sleep(condvar); \
+ pipe_mutex_lock(mutex); \
+ } while (0)
#define pipe_condvar_signal(condvar) \
(void) condvar
#endif /* PIPE_OS_? */
+/*
+ * pipe_barrier
+ */
+
+#if defined(PIPE_OS_LINUX) || defined(PIPE_OS_BSD) || defined(PIPE_OS_SOLARIS) || defined(PIPE_OS_HAIKU)
+
+typedef pthread_barrier_t pipe_barrier;
+
+static INLINE void pipe_barrier_init(pipe_barrier *barrier, unsigned count)
+{
+ pthread_barrier_init(barrier, NULL, count);
+}
+
+static INLINE void pipe_barrier_destroy(pipe_barrier *barrier)
+{
+ pthread_barrier_destroy(barrier);
+}
+
+static INLINE void pipe_barrier_wait(pipe_barrier *barrier)
+{
+ pthread_barrier_wait(barrier);
+}
+
+
+#else /* If the OS doesn't have its own, implement barriers using a mutex and a condvar */
+
+typedef struct {
+ unsigned count;
+ unsigned waiters;
+ uint64_t sequence;
+ pipe_mutex mutex;
+ pipe_condvar condvar;
+} pipe_barrier;
+
+static INLINE void pipe_barrier_init(pipe_barrier *barrier, unsigned count)
+{
+ barrier->count = count;
+ barrier->waiters = 0;
+ barrier->sequence = 0;
+ pipe_mutex_init(barrier->mutex);
+ pipe_condvar_init(barrier->condvar);
+}
+
+static INLINE void pipe_barrier_destroy(pipe_barrier *barrier)
+{
+ assert(barrier->waiters == 0);
+ pipe_mutex_destroy(barrier->mutex);
+ pipe_condvar_destroy(barrier->condvar);
+}
+
+static INLINE void pipe_barrier_wait(pipe_barrier *barrier)
+{
+ pipe_mutex_lock(barrier->mutex);
+
+ assert(barrier->waiters < barrier->count);
+ barrier->waiters++;
+
+ if (barrier->waiters < barrier->count) {
+ uint64_t sequence = barrier->sequence;
+
+ do {
+ pipe_condvar_wait(barrier->condvar, barrier->mutex);
+ } while (sequence == barrier->sequence);
+ } else {
+ barrier->waiters = 0;
+ barrier->sequence++;
+ pipe_condvar_broadcast(barrier->condvar);
+ }
+
+ pipe_mutex_unlock(barrier->mutex);
+}
+
+
+#endif
+
+
+/*
+ * Semaphores
+ */
+
+typedef struct
+{
+ pipe_mutex mutex;
+ pipe_condvar cond;
+ int counter;
+} pipe_semaphore;
+
+
+static INLINE void
+pipe_semaphore_init(pipe_semaphore *sema, int init_val)
+{
+ pipe_mutex_init(sema->mutex);
+ pipe_condvar_init(sema->cond);
+ sema->counter = init_val;
+}
+
+static INLINE void
+pipe_semaphore_destroy(pipe_semaphore *sema)
+{
+ pipe_mutex_destroy(sema->mutex);
+ pipe_condvar_destroy(sema->cond);
+}
+
+/** Signal/increment semaphore counter */
+static INLINE void
+pipe_semaphore_signal(pipe_semaphore *sema)
+{
+ pipe_mutex_lock(sema->mutex);
+ sema->counter++;
+ pipe_condvar_signal(sema->cond);
+ pipe_mutex_unlock(sema->mutex);
+}
+
+/** Wait for semaphore counter to be greater than zero */
+static INLINE void
+pipe_semaphore_wait(pipe_semaphore *sema)
+{
+ pipe_mutex_lock(sema->mutex);
+ while (sema->counter <= 0) {
+ pipe_condvar_wait(sema->cond, sema->mutex);
+ }
+ sema->counter--;
+ pipe_mutex_unlock(sema->mutex);
+}
+
+
/*
* Thread-specific data.
*/
typedef struct {
-#if defined(PIPE_OS_LINUX) || defined(PIPE_OS_BSD) || defined(PIPE_OS_SOLARIS) || defined(PIPE_OS_APPLE) || defined(PIPE_OS_HAIKU)
+#if defined(PIPE_OS_LINUX) || defined(PIPE_OS_BSD) || defined(PIPE_OS_SOLARIS) || defined(PIPE_OS_APPLE) || defined(PIPE_OS_HAIKU) || defined(PIPE_OS_CYGWIN)
pthread_key_t key;
#elif defined(PIPE_SUBSYSTEM_WINDOWS_USER)
DWORD key;
static INLINE void
pipe_tsd_init(pipe_tsd *tsd)
{
-#if defined(PIPE_OS_LINUX) || defined(PIPE_OS_BSD) || defined(PIPE_OS_SOLARIS) || defined(PIPE_OS_APPLE) || defined(PIPE_OS_HAIKU)
+#if defined(PIPE_OS_LINUX) || defined(PIPE_OS_BSD) || defined(PIPE_OS_SOLARIS) || defined(PIPE_OS_APPLE) || defined(PIPE_OS_HAIKU) || defined(PIPE_OS_CYGWIN)
if (pthread_key_create(&tsd->key, NULL/*free*/) != 0) {
perror("pthread_key_create(): failed to allocate key for thread specific data");
exit(-1);
if (tsd->initMagic != (int) PIPE_TSD_INIT_MAGIC) {
pipe_tsd_init(tsd);
}
-#if defined(PIPE_OS_LINUX) || defined(PIPE_OS_BSD) || defined(PIPE_OS_SOLARIS) || defined(PIPE_OS_APPLE) || defined(PIPE_OS_HAIKU)
+#if defined(PIPE_OS_LINUX) || defined(PIPE_OS_BSD) || defined(PIPE_OS_SOLARIS) || defined(PIPE_OS_APPLE) || defined(PIPE_OS_HAIKU) || defined(PIPE_OS_CYGWIN)
return pthread_getspecific(tsd->key);
#elif defined(PIPE_SUBSYSTEM_WINDOWS_USER)
assert(0);
if (tsd->initMagic != (int) PIPE_TSD_INIT_MAGIC) {
pipe_tsd_init(tsd);
}
-#if defined(PIPE_OS_LINUX) || defined(PIPE_OS_BSD) || defined(PIPE_OS_SOLARIS) || defined(PIPE_OS_APPLE) || defined(PIPE_OS_HAIKU)
+#if defined(PIPE_OS_LINUX) || defined(PIPE_OS_BSD) || defined(PIPE_OS_SOLARIS) || defined(PIPE_OS_APPLE) || defined(PIPE_OS_HAIKU) || defined(PIPE_OS_CYGWIN)
if (pthread_setspecific(tsd->key, value) != 0) {
perror("pthread_set_specific() failed");
exit(-1);
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