Merge John Bossom's code into the main trunk. See ChangeLog for details.snapshot-1999-01-04-1305

This will be tagged as snapshot-1999-01-04-1305

1 files changed, 52 insertions, 0 deletions

diff --git a/semaphore.h b/semaphore.h
new file mode 100644
index 0000000..5eeaf3c
--- /dev/null
+++ b/semaphore.h
@@ -0,0 +1,52 @@
+/*
+ * -------------------------------------------------------------
+ *
+ * Module: semaphore.h
+ *
+ * Purpose:
+ *      Semaphores aren't actually part of the PThreads standard.
+ *      They are defined by the POSIX Standard:
+ *
+ *              POSIX 1003.1b-1993      (POSIX.1b)
+ *
+ *      They are supposed to follow the older UNIX convention for
+ *      reporting errors. That is, on failure they are supposed
+ *      to return a value of -1 and store the appropriate error
+ *      number into 'errno'.
+ *      HOWEVER,errno cannot be modified in a multithreaded
+ *      program on WIN32; therefore, the value is returned as
+ *      the function value.
+ *      It is recommended that you compare for zero (0) for success
+ *      instead of -1 for failure when checking the status of
+ *      these functions.
+ *
+ * -------------------------------------------------------------
+ */
+#if !defined( SEMAPHORE_H )
+#define SEMAPHORE_H
+
+#include <process.h>
+#include <errno.h>
+
+#ifdef __cplusplus
+extern "C"
+{
+#endif				/* __cplusplus */
+
+typedef HANDLE sem_t;
+
+int sem_init (sem_t * sem, int pshared, unsigned int value);
+
+int sem_destroy (sem_t * sem);
+
+int sem_trywait (sem_t * sem);
+
+int sem_wait (sem_t * sem);
+
+int sem_post (sem_t * sem);
+
+#ifdef __cplusplus
+}				/* End of extern "C" */
+#endif				/* __cplusplus */
+
+#endif				/* !SEMAPHORE_H */