Update.

1999-12-09  Andreas Jaeger  <aj@suse.de>

	* nis/nss_compat/compat-pwd.c (internal_getpwuid_r): Always set
	errno to ENOENT when returning NSS_STATUS_NOTFOUND.
	Reported by Christian Starkjohann <cs@obdev.at>.

1999-12-09  Andreas Jaeger  <aj@suse.de>

	* sysdeps/i386/fpu/libm-test-ulps: Added some ulps.

1999-12-09  Jakub Jelinek  <jakub@redhat.com>

	* stdlib/longlong.h: Update from latest egcs version.

	* sysdeps/sparc/fpu/fegetenv.c: Add semicolons.

	* sysdeps/unix/sysv/linux/bits/errno.h (__errno_location): __THROW
	has to preceede __attribute__, otherwise g++ barfs.

	* sysdeps/unix/sysv/linux/sparc/sys/ptrace.h: Make things compile
	on sparc64-*-linux.

	* sysdeps/unix/sysv/linux/sparc/sparc64/register-dump.h: Changed to
	use sigcontext.
	* sysdeps/unix/sysv/linux/sparc/sparc64/sigcontextinfo.h: Likewise.

1999-12-05  Wolfram Gloger  <wg@malloc.de>

	* malloc/malloc.c (arena_get2): If generating a new arena fails,
	try to generate a minimal one and hope for mmap_chunk() to succeed
	later.

1999-11-07  Wolfram Gloger  <wg@malloc.de>

	* malloc/thread-m.h [NO_THREADS]: The mutex_* macros now let
	mutex_t work as an `in-use' flag even without threads.
	* malloc/malloc.c (USE_ARENAS): New feature flag, controls support
	for multiple arenas separately from NO_THREADS.
	(mALLOc, chunk_realloc, mEMALIGn, cALLOc) [USE_ARENAS]: try to
	fall back to an mmap()ed arena when sbrk() has failed.

1 files changed, 11 insertions, 5 deletions

diff --git a/malloc/thread-m.h b/malloc/thread-m.h
index 1598db8ee7..d5b1e2f4b0 100644
--- a/malloc/thread-m.h
+++ b/malloc/thread-m.h
@@ -207,18 +207,24 @@ int tsd_key_next;
 
 typedef int thread_id;
 
+/* The mutex functions used to do absolutely nothing, i.e. lock,
+   trylock and unlock would always just return 0.  However, even
+   without any concurrently active threads, a mutex can be used
+   legitimately as an `in use' flag.  To make the code that is
+   protected by a mutex async-signal safe, these macros would have to
+   be based on atomic test-and-set operations, for example. */
 typedef int mutex_t;
 
 #define MUTEX_INITIALIZER          0
 #define mutex_init(m)              (*(m) = 0)
-#define mutex_lock(m)              (0)
-#define mutex_trylock(m)           (0)
-#define mutex_unlock(m)            (0)
+#define mutex_lock(m)              ((*(m) = 1), 0)
+#define mutex_trylock(m)           (*(m) ? 1 : ((*(m) = 1), 0))
+#define mutex_unlock(m)            (*(m) = 0)
 
 typedef void *tsd_key_t;
 #define tsd_key_create(key, destr) do {} while(0)
-#define tsd_setspecific(key, data) do {} while(0)
-#define tsd_getspecific(key, vptr) (vptr = NULL)
+#define tsd_setspecific(key, data) ((key) = (data))
+#define tsd_getspecific(key, vptr) (vptr = (key))
 
 #define thread_atfork(prepare, parent, child) do {} while(0)