[AOLSERVER] fix for Ns_MutexDestroy in 3.5 mutex.c

[Jonathan Ellis]

_mutexdestroy wasn't checking for a busy (locked by another thread) mutex:

-Jonathan
(Appologies if this is not the right forum, but the sourceforge patches
page doesn't look very busy.)

--- nsthread/mutex.c.old        Mon Mar 31 15:28:01 2003
+++ nsthread/mutex.c    Mon Mar 31 15:34:54 2003
@@ -168,10 +168,15 @@
 {
     Lock       **lockPtrPtr;
     Lock       *lockPtr = (Lock *) *mutexPtr;
-    int         err;
+    int         err = EBUSY;

     if (lockPtr != NULL) {
-       err = pthread_mutex_destroy(&lockPtr->mutex);
+       /* spinwait until it's unlocked */
+       while (err == EBUSY) {
+           err = pthread_mutex_destroy(&lockPtr->mutex);
+       }
+       /* {0,EBUSY} is supposed to be the only valid return codes for _destroy,
+          but we'll check anyway */
        if (err != 0) {
            NsThreadFatal("Ns_MutexDestroy", "ptread_mutex_destroy", err);
        }


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