From 7fdb900bc169f0105bf5fb2cd282f6448f3f11f7 Mon Sep 17 00:00:00 2001
From: rpj <rpj>
Date: Thu, 4 Nov 1999 17:18:43 +0000
Subject: 1999-11-05  Ross Johnson  <rpj@ixobrychus.canberra.edu.au>

        * general: Patched for portability to WinCE. The details are
        described in the file WinCE-PORT. Follow the instructions
        in README.WinCE to make the appropriate changes in config.h.
        - Tristan Savatier <tristan@mpegtv.com>
---
 semaphore.c | 126 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++--
 1 file changed, 122 insertions(+), 4 deletions(-)

(limited to 'semaphore.c')

diff --git a/semaphore.c b/semaphore.c
index 0fcfc94..a8c346e 100644
--- a/semaphore.c
+++ b/semaphore.c
@@ -43,14 +43,13 @@
  */
 
 #include <windows.h>
-#include <process.h>
-#include <sys/timeb.h>
+//#include <process.h>
+//#include <sys/timeb.h>
 #include <string.h>
 
 #include "pthread.h"
 #include "semaphore.h"
 
-
 int
 sem_init (sem_t * sem, int pshared, unsigned int value)
      /*
@@ -90,6 +89,7 @@ sem_init (sem_t * sem, int pshared, unsigned int value)
 {
   int result = 0;
 
+
   if (pshared != 0)
     {
       /*
@@ -101,6 +101,22 @@ sem_init (sem_t * sem, int pshared, unsigned int value)
     }
   else
     {
+
+#ifdef NEED_SEM
+
+      sem->value = value;
+      pthread_mutex_init(&sem->mutex, NULL);
+      sem->event = CreateEvent (NULL,
+				FALSE,	/* manual reset */
+				FALSE,	/* initial state */
+				NULL);
+      if (value != 0)
+        {
+	  SetEvent(sem->event);
+        }
+
+#else /* NEED_SEM */
+
       /*
        * NOTE: Taking advantage of the fact that
        *               sem_t is a simple structure with one entry;
@@ -116,6 +132,9 @@ sem_init (sem_t * sem, int pshared, unsigned int value)
 	{
 	  result = ENOSPC;
 	}
+
+#endif /* NEED_SEM */
+
     }
 
   if (result != 0)
@@ -161,11 +180,27 @@ sem_destroy (sem_t * sem)
     {
       result = EINVAL;
     }
+
+#ifdef NEED_SEM
+
+  else
+    {
+      pthread_mutex_destroy(&sem->mutex);
+      if (!CloseHandle(sem->event))
+        {
+          result = EINVAL;
+        }
+    }
+
+#else /* NEED_SEM */
+
   else if (! CloseHandle (*sem))
     {
       result = EINVAL;
     }
 
+#endif /* NEED_SEM */
+
   if (result != 0)
     {
       errno = result;
@@ -213,11 +248,22 @@ sem_trywait (sem_t * sem)
     {
       result = EINVAL;
     }
+
+#ifdef NEED_SEM
+
+  /* not yet implemented! */
+  result = EINVAL;
+  return -1;
+
+#else /* NEED_SEM */
+
   else if (WaitForSingleObject (*sem, 0) == WAIT_TIMEOUT)
     {
       result = EAGAIN;
     }
 
+#endif /* NEED_SEM */
+
   if (result != 0)
     {
       errno = result;
@@ -229,6 +275,53 @@ sem_trywait (sem_t * sem)
 }				/* sem_trywait */
 
 
+#ifdef NEED_SEM
+
+void 
+_pthread_decrease_semaphore(sem_t * sem)
+{
+  pthread_mutex_lock(&sem->mutex);
+
+  if (sem->value != 0)
+    {
+      sem->value--;
+      if (sem->value != 0)
+        {
+          SetEvent(sem->event);
+        }
+    }
+  else
+    {
+      /* this case should not happen! */
+    }
+
+  pthread_mutex_unlock(&sem->mutex);
+}
+
+BOOL 
+_pthread_increase_semaphore(sem_t * sem, unsigned int n)
+{
+  BOOL result;
+
+  pthread_mutex_lock(&sem->mutex);
+
+  if (sem->value + n > sem->value)
+    {
+       sem->value += n;
+       SetEvent(sem->event);
+       result = TRUE;
+    }
+  else
+    {
+       result = FALSE;
+    }
+
+  pthread_mutex_unlock(&sem->mutex);
+  return result;
+}
+
+#endif /* NEED_SEM */
+
 int
 sem_wait (sem_t * sem)
      /*
@@ -268,7 +361,17 @@ sem_wait (sem_t * sem)
     }
   else
     {
+
+#ifdef NEED_SEM
+
+	result = pthreadCancelableWait (sem->event);
+
+#else /* NEED_SEM */
+
 	result = pthreadCancelableWait (*sem);
+
+#endif /* NEED_SEM */
+
     }
 
   if (result != 0)
@@ -277,6 +380,12 @@ sem_wait (sem_t * sem)
       return -1;
     }
 
+#ifdef NEED_SEM
+
+  _decrease_semaphore(sem);
+
+#endif /* NEED_SEM */
+
   return 0;
 
 }				/* sem_wait */
@@ -314,12 +423,21 @@ sem_post (sem_t * sem)
     {
 	result = EINVAL;
     }
+
+#ifdef NEED_SEM
+
+  else if (! _increase_semaphore (sem, 1))
+
+#else /* NEED_SEM */
+
   else if (! ReleaseSemaphore (*sem, 1, 0))
+
+#endif /* NEED_SEM */
+
     {
 	result = EINVAL;
     }
 
-
   if (result != 0)
     {
       errno = result;
-- 
cgit v1.2.3