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gthr.h: Document __GTHREAD_MUTEX_INIT_FUNCTION.

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* gthr.h: Document __GTHREAD_MUTEX_INIT_FUNCTION.
        * frame.c (init_object_mutex): New function.
        (init_object_mutex_once): Likewise.
        (find_fde): Call it.
        (__register_frame_info): Likewise.
        (__register_frame_info_table): Likewise.
        (__deregister_frame_info): Likewise.

From-SVN: r22023
This commit is contained in:
Tom Tromey 1998-08-27 14:51:55 +00:00 committed by Tom Tromey
parent 54c3cf4bb9
commit 3e2a2957a0
3 changed files with 49 additions and 2 deletions
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10
gcc/ChangeLog
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@ -1,3 +1,13 @@
Wed Aug 26 17:13:37 1998 Tom Tromey <tromey@cygnus.com>
* gthr.h: Document __GTHREAD_MUTEX_INIT_FUNCTION.
* frame.c (init_object_mutex): New function.
(init_object_mutex_once): Likewise.
(find_fde): Call it.
(__register_frame_info): Likewise.
(__register_frame_info_table): Likewise.
(__deregister_frame_info): Likewise.
Thu Aug 27 15:14:18 1998 Jeffrey A Law (law@cygnus.com)
* haifa-sched.c (sched_analyze_insn): Fix thinko in last change.

33
gcc/frame.c
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@ -1,6 +1,6 @@
/* Subroutines needed for unwinding stack frames for exception handling. */
/* Compile this one with gcc. */
/* Copyright (C) 1997 Free Software Foundation, Inc.
/* Copyright (C) 1997, 1998 Free Software Foundation, Inc.
Contributed by Jason Merrill <jason@cygnus.com>.
This file is part of GNU CC.
@ -115,6 +115,33 @@ struct frame_state_internal
struct frame_state_internal *saved_state;
};
/* This is undefined below if we need it to be an actual function. */
#define init_object_mutex_once()
#if __GTHREADS
#ifdef __GTHREAD_MUTEX_INIT_FUNCTION
/* Helper for init_object_mutex_once. */
static void
init_object_mutex (void)
{
__GTHREAD_MUTEX_INIT_FUNCTION (&object_mutex);
}
/* Call this to arrange to initialize the object mutex. */
#undef init_object_mutex_once
static void
init_object_mutex_once (void)
{
static __gthread_once_t once = __GTHREAD_ONCE_INIT;
__gthread_once (&once, init_object_mutex);
}
#endif /* __GTHREAD_MUTEX_INIT_FUNCTION */
#endif /* __GTHREADS */
/* Decode the unsigned LEB128 constant at BUF into the variable pointed to
by R, and return the new value of BUF. */
@ -468,6 +495,7 @@ find_fde (void *pc)
struct object *ob;
size_t lo, hi;
init_object_mutex_once ();
__gthread_mutex_lock (&object_mutex);
for (ob = objects; ob; ob = ob->next)
@ -685,6 +713,7 @@ __register_frame_info (void *begin, struct object *ob)
ob->fde_array = 0;
ob->count = 0;
init_object_mutex_once ();
__gthread_mutex_lock (&object_mutex);
ob->next = objects;
@ -713,6 +742,7 @@ __register_frame_info_table (void *begin, struct object *ob)
ob->pc_begin = ob->pc_end = 0;
ob->count = 0;
init_object_mutex_once ();
__gthread_mutex_lock (&object_mutex);
ob->next = objects;
@ -735,6 +765,7 @@ __deregister_frame_info (void *begin)
{
struct object **p;
init_object_mutex_once ();
__gthread_mutex_lock (&object_mutex);
p = &objects;

8
gcc/gthr.h
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@ -1,6 +1,6 @@
/* Threads compatibily routines for libgcc2. */
/* Compile this one with gcc. */
/* Copyright (C) 1997 Free Software Foundation, Inc.
/* Copyright (C) 1997, 1998 Free Software Foundation, Inc.
This file is part of GNU CC.
@ -48,6 +48,12 @@ Boston, MA 02111-1307, USA. */
__GTHREAD_MUTEX_INIT
to initialize __gthread_mutex_t to get a fast
non-recursive mutex.
__GTHREAD_MUTEX_INIT_FUNCTION
some systems can't initalize a mutex without a
function call. On such systems, define this to a
function which looks like this:
void __GTHREAD_MUTEX_INIT_FUNCTION (__gthread_mutex_t *)
Don't define __GTHREAD_MUTEX_INIT in this case
The threads interface must define the following static functions: