"virtualize" and allow overriding of thread creation function, to allow Wine support

git-svn-id: svn+ssh://jackaudio.org/trunk/jack@3432 0c269be4-1314-0410-8aa9-9f06e86f4224

jack/thread.h

@@ -102,6 +102,29 @@ int jack_client_create_thread (jack_client_t* client,
  */
 int jack_drop_real_time_scheduling (pthread_t thread);
 
+typedef int (*jack_thread_creator_t)(pthread_t*,
+				     const pthread_attr_t*,
+				     void* (*function)(void*),
+				     void* arg);
+/**
+ * This function can be used in very very specialized cases
+ * where it is necessary that client threads created by JACK
+ * are created by something other than pthread_create(). After
+ * it is used, any threads that JACK needs for the client will
+ * will be created by calling the function passed to this
+ * function. 
+ *
+ * No normal application/client should consider calling this.
+ * The specific case for which it was created involves running
+ * win32/x86 plugins under Wine on Linux, where it is necessary
+ * that all threads that might call win32 functions are known
+ * to Wine.
+ * 
+ * @param creator a function that creates a new thread
+ * 
+ */
+void jack_set_thread_creator (jack_thread_creator_t creator);
+
 /* @} */
 
 #ifdef __cplusplus

libjack/messagebuffer.c

@@ -92,7 +92,7 @@ jack_messagebuffer_init ()
 	mb_overruns = 0;
 	mb_initialized = 1;
 
-	if (pthread_create(&mb_writer_thread, NULL, &mb_thread_func, NULL) != 0)
+	if (jack_thread_creator (&mb_writer_thread, NULL, &mb_thread_func, NULL) != 0)
 		mb_initialized = 0;
 }
 

libjack/thread.c

@@ -39,6 +39,14 @@
 #include <sysdeps/pThreadUtilities.h>
 #endif
 
+jack_thread_creator_t jack_thread_creator = pthread_create;
+
+void
+jack_set_thread_creator (jack_thread_creator_t jtc) 
+{
+	jack_thread_creator = jtc;
+}
+
 static inline void
 log_result (char *msg, int res)
 {
@@ -126,7 +134,7 @@ jack_client_create_thread (jack_client_t* client,
 	int result = 0;
 
 	if (!realtime) {
-		result = pthread_create (thread, 0, start_routine, arg);
+		result = jack_thread_creator (thread, 0, start_routine, arg);
 		if (result) {
 			log_result("creating thread with default parameters",
 				   result);
@@ -176,7 +184,7 @@ jack_client_create_thread (jack_client_t* client,
 	thread_args->realtime = 1;
 	thread_args->priority = priority;
 
-	result = pthread_create (thread, &attr, jack_thread_proxy, thread_args);
+	result = jack_thread_creator (thread, &attr, jack_thread_proxy, thread_args);
 	if (result) {
 		log_result ("creating realtime thread", result);
 		return result;
@@ -184,7 +192,7 @@ jack_client_create_thread (jack_client_t* client,
 
 #else /* JACK_USE_MACH_THREADS */
 
-	result = pthread_create (thread, 0, start_routine, arg);
+	result = jack_thread_creator (thread, 0, start_routine, arg);
 	if (result) {
 		log_result ("creating realtime thread", result);
 		return result;