From 515f40908328b96ef0298b7a057bdcb70ed06b21 Mon Sep 17 00:00:00 2001
From: "Ryan C. Gordon" <icculus@icculus.org>
Date: Tue, 3 Apr 2007 05:01:13 +0000
Subject: [PATCH] Reverted change r857:858...recursive mutex APIs sort of suck
 for portability.

---
 platform/unix.c | 64 +++++++++++++++++++++++++++++--------------------
 1 file changed, 38 insertions(+), 26 deletions(-)

diff --git a/platform/unix.c b/platform/unix.c
index 858f3be6..2b47cc99 100644
--- a/platform/unix.c
+++ b/platform/unix.c
@@ -289,7 +289,6 @@ int __PHYSFS_platformSetDefaultAllocator(PHYSFS_Allocator *a)
 } /* __PHYSFS_platformSetDefaultAllocator */
 
 
-
 #if (defined PHYSFS_NO_PTHREADS_SUPPORT)
 
 PHYSFS_uint64 __PHYSFS_platformGetThreadID(void) { return(0x0001); }
@@ -300,6 +299,13 @@ void __PHYSFS_platformReleaseMutex(void *mutex) {}
 
 #else
 
+typedef struct
+{
+    pthread_mutex_t mutex;
+    pthread_t owner;
+    PHYSFS_uint32 count;
+} PthreadMutex;
+
 /* Just in case; this is a panic value. */
 #if ((!defined SIZEOF_INT) || (SIZEOF_INT <= 0))
 #  define SIZEOF_INT 4
@@ -323,56 +329,62 @@ PHYSFS_uint64 __PHYSFS_platformGetThreadID(void)
 
 void *__PHYSFS_platformCreateMutex(void)
 {
-    pthread_mutex_t *m = NULL;
-    pthread_mutexattr_t attr;
     int rc;
-
-    rc = pthread_mutexattr_init(&attr);
-    if (rc == 0)
-    {
-        rc = pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE);
-        if (rc == 0)
-        {
-            m = (pthread_mutex_t *) allocator.Malloc(sizeof (pthread_mutex_t));
-            if (m == NULL)
-                rc = ENOMEM;
-            else
-                rc = pthread_mutex_init(m, &attr);
-        } /* if */
-        pthread_mutexattr_destroy(&attr);
-    } /* if */
-
+    PthreadMutex *m = (PthreadMutex *) allocator.Malloc(sizeof (PthreadMutex));
+    BAIL_IF_MACRO(m == NULL, ERR_OUT_OF_MEMORY, NULL);
+    rc = pthread_mutex_init(&m->mutex, NULL);
     if (rc != 0)
     {
         allocator.Free(m);
         BAIL_MACRO(strerror(rc), NULL);
     } /* if */
 
+    m->count = 0;
+    m->owner = (pthread_t) 0xDEADBEEF;
     return((void *) m);
 } /* __PHYSFS_platformCreateMutex */
 
 
 void __PHYSFS_platformDestroyMutex(void *mutex)
 {
-    pthread_mutex_t *m = (pthread_mutex_t *) mutex;
-    pthread_mutex_destroy(m);
+    PthreadMutex *m = (PthreadMutex *) mutex;
+
+    /* Destroying a locked mutex is a bug, but we'll try to be helpful. */
+    if ((m->owner == pthread_self()) && (m->count > 0))
+        pthread_mutex_unlock(&m->mutex);
+
+    pthread_mutex_destroy(&m->mutex);
     allocator.Free(m);
 } /* __PHYSFS_platformDestroyMutex */
 
 
 int __PHYSFS_platformGrabMutex(void *mutex)
 {
-    pthread_mutex_t *m = (pthread_mutex_t *) mutex;
-    if (pthread_mutex_lock(m) != 0)
-        return(0);
+    PthreadMutex *m = (PthreadMutex *) mutex;
+    pthread_t tid = pthread_self();
+    if (m->owner != tid)
+    {
+        if (pthread_mutex_lock(&m->mutex) != 0)
+            return(0);
+        m->owner = tid;
+    } /* if */
+
+    m->count++;
     return(1);
 } /* __PHYSFS_platformGrabMutex */
 
 
 void __PHYSFS_platformReleaseMutex(void *mutex)
 {
-    pthread_mutex_t *m = (pthread_mutex_t *) mutex;
-    pthread_mutex_unlock(m);
+    PthreadMutex *m = (PthreadMutex *) mutex;
+    if (m->owner == pthread_self())
+    {
+        if (--m->count == 0)
+        {
+            m->owner = (pthread_t) 0xDEADBEEF;
+            pthread_mutex_unlock(&m->mutex);
+        } /* if */
+    } /* if */
 } /* __PHYSFS_platformReleaseMutex */
 
 #endif /* !PHYSFS_NO_PTHREADS_SUPPORT */