Add weak definitions for wrapped system calls. In general:

	_foo - wrapped system call
	foo - weak definition to _foo

and for cancellation points:

	_foo - wrapped system call
	__foo - enter cancellation point, call _foo(), leave
	        cancellation point
	foo - weak definition to __foo

Change use of global _thread_run to call a function to get the
currently running thread.

Make all pthread_foo functions weak definitions to _pthread_foo,
where _pthread_foo is the implementation.  This allows an application
to provide its own pthread functions.

Provide slightly different versions of pthread_mutex_lock and
pthread_mutex_init so that we can tell the difference between
a libc mutex and an application mutex.  Threads holding mutexes
internal to libc should never be allowed to exit, call signal
handlers, or cancel.

Approved by:	-arch

1 files changed, 6 insertions, 5 deletions

diff --git a/lib/libpthread/thread/thr_sigaction.c b/lib/libpthread/thread/thr_sigaction.c
index 4d13819..dba2f7e 100644
--- a/lib/libpthread/thread/thr_sigaction.c
+++ b/lib/libpthread/thread/thr_sigaction.c
@@ -33,10 +33,11 @@
  */
 #include <signal.h>
 #include <errno.h>
-#ifdef _THREAD_SAFE
 #include <pthread.h>
 #include "pthread_private.h"
 
+#pragma weak	sigaction=_sigaction
+
 int
 _sigaction(int sig, const struct sigaction * act, struct sigaction * oact)
 {
@@ -49,6 +50,9 @@ _sigaction(int sig, const struct sigaction * act, struct sigaction * oact)
 		errno = EINVAL;
 		ret = -1;
 	} else {
+		if (_thread_initial == NULL)
+			_thread_init();
+
 		/*
 		 * Check if the existing signal action structure contents are
 		 * to be returned: 
@@ -98,7 +102,7 @@ _sigaction(int sig, const struct sigaction * act, struct sigaction * oact)
 				gact.sa_handler = (void (*) ()) _thread_sig_handler;
 
 			/* Change the signal action in the kernel: */
-		    	if (_thread_sys_sigaction(sig,&gact,NULL) != 0)
+		    	if (__sys_sigaction(sig,&gact,NULL) != 0)
 				ret = -1;
 		}
 	}
@@ -106,6 +110,3 @@ _sigaction(int sig, const struct sigaction * act, struct sigaction * oact)
 	/* Return the completion status: */
 	return (ret);
 }
-
-__strong_reference(_sigaction, sigaction);
-#endif