Use a jump table (a la Solaris) for pthread routines with default

entries in the table being stubs.  While I'm here, add macros to
auto-generate the stubs.  A conforming threads library can override
the stub routines by filling in the jump table.

Add some entries to namespace.h and sync un-namespace.h to it.
Also add a comment to remind folks to update un-namespace.h
when changing namespace.h.

1 files changed, 42 insertions, 0 deletions

diff --git a/lib/libc/include/libc_private.h b/lib/libc/include/libc_private.h
index e47e756..96ee8ad 100644
--- a/lib/libc/include/libc_private.h
+++ b/lib/libc/include/libc_private.h
@@ -64,6 +64,48 @@ extern int	__isthreaded;
 #define	FUNLOCKFILE(fp)		if (__isthreaded) _funlockfile(fp)
 
 /*
+ * Indexes into the pthread jump table.
+ *
+ * Warning! If you change this type, you must also change the threads
+ * libraries that reference it (libc_r, libpthread).
+ */
+typedef enum {
+	PJT_COND_BROADCAST,
+	PJT_COND_DESTROY,
+	PJT_COND_INIT,
+	PJT_COND_SIGNAL,
+	PJT_COND_WAIT,
+	PJT_GETSPECIFIC,
+	PJT_KEY_CREATE,
+	PJT_KEY_DELETE,
+	PJT_MAIN_NP,
+	PJT_MUTEX_DESTROY,
+	PJT_MUTEX_INIT,
+	PJT_MUTEX_LOCK,
+	PJT_MUTEX_TRYLOCK,
+	PJT_MUTEX_UNLOCK,
+	PJT_MUTEXATTR_DESTROY,
+	PJT_MUTEXATTR_INIT,
+	PJT_MUTEXATTR_SETTYPE,
+	PJT_ONCE,
+	PJT_RWLOCK_DESTROY,
+	PJT_RWLOCK_INIT,
+	PJT_RWLOCK_RDLOCK,
+	PJT_RWLOCK_TRYRDLOCK,
+	PJT_RWLOCK_TRYWRLOCK,
+	PJT_RWLOCK_UNLOCK,
+	PJT_RWLOCK_WRLOCK,
+	PJT_SELF,
+	PJT_SETSPECIFIC,
+	PJT_SIGMASK,
+	PJT_MAX
+} pjt_index_t;
+
+typedef int (*pthread_func_t)();
+
+extern pthread_func_t __thr_jtable[][];
+
+/*
  * This is a pointer in the C run-time startup code. It is used
  * by getprogname() and setprogname().
  */