using namespace PBD;
-ProcessSemaphore::ProcessSemaphore (const char* name, int val)
+Semaphore::Semaphore (const char* name, int val)
{
-#ifdef PLATFORM_WINDOWS
+#ifdef WINDOWS_SEMAPHORE
if ((_sem = CreateSemaphore(NULL, val, 32767, name)) == NULL) {
throw failed_constructor ();
}
}
/* this semaphore does not exist for IPC */
-
+
if (sem_unlink (name)) {
throw failed_constructor ();
}
#else
+ (void) name; /* stop gcc warning on !Apple systems */
+
if (sem_init (&_sem, 0, val)) {
throw failed_constructor ();
}
#endif
}
-ProcessSemaphore::~ProcessSemaphore ()
+Semaphore::~Semaphore ()
{
-#ifdef PLATFORM_WINDOWS
+#ifdef WINDOWS_SEMAPHORE
CloseHandle(_sem);
#elif __APPLE__
sem_close (ptr_to_sem());
#endif
}
-#ifdef PLATFORM_WINDOWS
+#ifdef WINDOWS_SEMAPHORE
int
-ProcessSemaphore::signal ()
+Semaphore::signal ()
{
// non-zero on success, opposite to posix
return !ReleaseSemaphore(_sem, 1, NULL);
}
int
-ProcessSemaphore::wait ()
+Semaphore::wait ()
{
DWORD result = 0;
result = WaitForSingleObject(_sem, INFINITE);
return (result == WAIT_OBJECT_0);
}
+int
+Semaphore::reset ()
+{
+ int rv = -1;
+ DWORD result;
+ do {
+ ++rv;
+ result = WaitForSingleObject(_sem, 0);
+ } while (result == WAIT_OBJECT_0);
+ return rv;
+}
+
#endif