aboutsummaryrefslogtreecommitdiff
path: root/linuxthreads/mutex.c
diff options
context:
space:
mode:
authorUlrich Drepper <drepper@redhat.com>1998-06-09 15:16:55 +0000
committerUlrich Drepper <drepper@redhat.com>1998-06-09 15:16:55 +0000
commitbf7997b65c7887d2acda95f5201d818a19d81711 (patch)
treeda3583de3a0b5892f90a4b1eb773a87b554ae37e /linuxthreads/mutex.c
parent7646e67e6cc4c738a7b402c60fed39d52db0433b (diff)
downloadglibc-bf7997b65c7887d2acda95f5201d818a19d81711.tar
glibc-bf7997b65c7887d2acda95f5201d818a19d81711.tar.gz
glibc-bf7997b65c7887d2acda95f5201d818a19d81711.tar.bz2
glibc-bf7997b65c7887d2acda95f5201d818a19d81711.zip
Update.
1998-06-09 Ulrich Drepper <drepper@cygnus.com> * sysdeps/unix/sysv/linux/netinet/ip.h (struct ip_options): Define __data member only for gcc. Reported by ak@muc.de. * misc/mntent.h: Undo last patch. * sysdeps/unix/sysv/linux/fstatvfs.c (fstatvfs): Undo last patch. * misc/tst/mntent.c: Adjust code for this change. * io/fts.c: Updated from a slightly more recent BSD version. * io/fts.h: Likewise. * libc.map: Add __libc_stack_end. * db2/Makefile (routines): Add lock_region. * db2/config.h: Update from db-2.4.14. * db2/db.h: Likewise. * db2/db_185.h: Likewise. * db2/db_int.h: Likewise. * db2/bt_close.c: Likewise. * db2/bt_compare.c: Likewise. * db2/bt_conv.c: Likewise. * db2/bt_cursor.c: Likewise. * db2/bt_delete.c: Likewise. * db2/bt_open.c: Likewise. * db2/bt_page.c: Likewise. * db2/bt_put.c: Likewise. * db2/bt_rec.c: Likewise. * db2/bt_recno.c: Likewise. * db2/bt_rsearch.c: Likewise. * db2/bt_search.c: Likewise. * db2/bt_split.c: Likewise. * db2/bt_stat.c: Likewise. * db2/btree.src: Likewise. * db2/btree_auto.c: Likewise. * db2/getlong.c: Likewise. * db2/db_appinit.c: Likewise. * db2/db_apprec.c: Likewise. * db2/db_byteorder.c: Likewise. * db2/db_err.c: Likewise. * db2/db_log2.c: Likewise. * db2/db_region.c: Likewise. * db2/db_salloc.c: Likewise. * db2/db_shash.c: Likewise. * db2/db.c: Likewise. * db2/db.src: Likewise. * db2/db_auto.c: Likewise. * db2/db_conv.c: Likewise. * db2/db_dispatch.c: Likewise. * db2/db_dup.c: Likewise. * db2/db_overflow.c: Likewise. * db2/db_pr.c: Likewise. * db2/db_rec.c: Likewise. * db2/db_ret.c: Likewise. * db2/db_thread.c: Likewise. * db2/db185.c: Likewise. * db2/db185_int.h: Likewise. * db2/dbm.c: Likewise. * db2/hash.c: Likewise. * db2/hash.src: Likewise. * db2/hash_auto.c: Likewise. * db2/hash_conv.c: Likewise. * db2/hash_debug.c: Likewise. * db2/hash_dup.c: Likewise. * db2/hash_func.c: Likewise. * db2/hash_page.c: Likewise. * db2/hash_rec.c: Likewise. * db2/hash_stat.c: Likewise. * db2/btree.h: Likewise. * db2/btree_ext.h: Likewise. * db2/clib_ext.h: Likewise. * db2/common_ext.h: Likewise. * db2/cxx_int.h: Likewise. * db2/db.h.src: Likewise. * db2/db_185.h.src: Likewise. * db2/db_am.h: Likewise. * db2/db_auto.h: Likewise. * db2/db_cxx.h: Likewise. * db2/db_dispatch.h: Likewise. * db2/db_ext.h: Likewise. * db2/db_int.h.src: Likewise. * db2/db_page.h: Likewise. * db2/db_shash.h: Likewise. * db2/db_swap.h: Likewise. * db2/hash.h: Likewise. * db2/hash_ext.h: Likewise. * db2/lock.h: Likewise. * db2/lock_ext.h: Likewise. * db2/log.h: Likewise. * db2/log_ext.h: Likewise. * db2/mp.h: Likewise. * db2/mp_ext.h: Likewise. * db2/mutex_ext.h: Likewise. * db2/os_ext.h: Likewise. * db2/os_func.h: Likewise. * db2/queue.h: Likewise. * db2/shqueue.h: Likewise. * db2/txn.h: Likewise. * db2/lock.c: Likewise. * db2/lock_conflict.c: Likewise. * db2/lock_deadlock.c: Likewise. * db2/lock_region.c: Likewise. * db2/lock_util.c: Likewise. * db2/log.c: Likewise. * db2/log.src: Likewise. * db2/log_archive.c: Likewise. * db2/log_auto.c: Likewise. * db2/log_compare.c: Likewise. * db2/log_findckp.c: Likewise. * db2/log_get.c: Likewise. * db2/log_put.c: Likewise. * db2/log_rec.c: Likewise. * db2/log_register.c: Likewise. * db2/mp_bh.c: Likewise. * db2/mp_fget.c: Likewise. * db2/mp_fopen.c: Likewise. * db2/mp_fput.c: Likewise. * db2/mp_fset.c: Likewise. * db2/mp_open.c: Likewise. * db2/mp_pr.c: Likewise. * db2/mp_region.c: Likewise. * db2/mp_sync.c: Likewise. * db2/68020.gcc: Likewise. * db2/mutex.c: Likewise. * db2/parisc.gcc: Likewise. * db2/parisc.hp: Likewise. * db2/sco.cc: Likewise. * db2/os_abs.c: Likewise. * db2/os_alloc.c: Likewise. * db2/os_config.c: Likewise. * db2/os_dir.c: Likewise. * db2/os_fid.c: Likewise. * db2/os_fsync.c: Likewise. * db2/os_map.c: Likewise. * db2/os_oflags.c: Likewise. * db2/os_open.c: Likewise. * db2/os_rpath.c: Likewise. * db2/os_rw.c: Likewise. * db2/os_seek.c: Likewise. * db2/os_sleep.c: Likewise. * db2/os_spin.c: Likewise. * db2/os_stat.c: Likewise. * db2/os_unlink.c: Likewise. * db2/db_archive.c: Likewise. * db2/db_checkpoint.c: Likewise. * db2/db_deadlock.c: Likewise. * db2/db_dump.c: Likewise. * db2/db_dump185.c: Likewise. * db2/db_load.c: Likewise. * db2/db_printlog.c: Likewise. * db2/db_recover.c: Likewise. * db2/db_stat.c: Likewise. * db2/txn.c: Likewise. * db2/txn.src: Likewise. * db2/txn_auto.c: Likewise. * db2/txn_rec.c: Likewise. * elf/rtld.c: Move definition of __libc_stack_end to ... * sysdeps/generic/dl-sysdep.h: ...here. * sysdeps/unix/sysv/linux/fstatvfs.c: Handle nodiratime option. * sysdeps/unix/sysv/linux/bits/statvfs.h: Define ST_NODIRATIME. * sysdeps/unix/sysv/linux/sys/mount.h: Define MS_NODIRATIME. 1998-06-08 21:44 Ulrich Drepper <drepper@cygnus.com> * sysdeps/unix/sysv/linux/fstatvfs.c: Handle constant option string from mntent correctly. 1998-06-06 Andreas Jaeger <aj@arthur.rhein-neckar.de> * sunrpc/Makefile (generated): Correct typo. 1998-06-04 Philip Blundell <philb@gnu.org> * elf/elf.h (EM_ARM, et al.): New definitions. * sysdeps/arm/dl-machine.h: Update for new draft ARM ELF ABI.
Diffstat (limited to 'linuxthreads/mutex.c')
-rw-r--r--linuxthreads/mutex.c91
1 files changed, 48 insertions, 43 deletions
diff --git a/linuxthreads/mutex.c b/linuxthreads/mutex.c
index d4ebcb827a..3b40ac04c5 100644
--- a/linuxthreads/mutex.c
+++ b/linuxthreads/mutex.c
@@ -91,47 +91,49 @@ int __pthread_mutex_lock(pthread_mutex_t * mutex)
{
pthread_descr self;
- while(1) {
- acquire(&mutex->m_spinlock);
- switch(mutex->m_kind) {
- case PTHREAD_MUTEX_FAST_NP:
- if (mutex->m_count == 0) {
- mutex->m_count = 1;
- release(&mutex->m_spinlock);
- return 0;
- }
- self = thread_self();
- break;
- case PTHREAD_MUTEX_RECURSIVE_NP:
- self = thread_self();
- if (mutex->m_count == 0 || mutex->m_owner == self) {
- mutex->m_count++;
- mutex->m_owner = self;
- release(&mutex->m_spinlock);
- return 0;
- }
- break;
- case PTHREAD_MUTEX_ERRORCHECK_NP:
- self = thread_self();
- if (mutex->m_count == 0) {
- mutex->m_count = 1;
- mutex->m_owner = self;
- release(&mutex->m_spinlock);
- return 0;
- } else if (mutex->m_owner == self) {
- release(&mutex->m_spinlock);
- return EDEADLK;
- }
- break;
- default:
+ acquire(&mutex->m_spinlock);
+ switch(mutex->m_kind) {
+ case PTHREAD_MUTEX_FAST_NP:
+ if (mutex->m_count == 0) {
+ mutex->m_count = 1;
+ release(&mutex->m_spinlock);
+ return 0;
+ }
+ self = thread_self();
+ break;
+ case PTHREAD_MUTEX_RECURSIVE_NP:
+ self = thread_self();
+ if (mutex->m_count == 0 || mutex->m_owner == self) {
+ mutex->m_count++;
+ mutex->m_owner = self;
+ release(&mutex->m_spinlock);
+ return 0;
+ }
+ break;
+ case PTHREAD_MUTEX_ERRORCHECK_NP:
+ self = thread_self();
+ if (mutex->m_count == 0) {
+ mutex->m_count = 1;
+ mutex->m_owner = self;
release(&mutex->m_spinlock);
- return EINVAL;
+ return 0;
+ } else if (mutex->m_owner == self) {
+ release(&mutex->m_spinlock);
+ return EDEADLK;
}
- /* Suspend ourselves, then try again */
- enqueue(&mutex->m_waiting, self);
+ break;
+ default:
release(&mutex->m_spinlock);
- suspend(self); /* This is not a cancellation point */
+ return EINVAL;
}
+ /* Suspend ourselves */
+ enqueue(&mutex->m_waiting, self);
+ release(&mutex->m_spinlock);
+ suspend(self); /* This is not a cancellation point */
+ /* Now we own the mutex */
+ ASSERT(mutex->m_count == 1);
+ mutex->m_owner = self; /* for recursive and errorcheck mutexes */
+ return 0;
}
weak_alias (__pthread_mutex_lock, pthread_mutex_lock)
@@ -142,30 +144,33 @@ int __pthread_mutex_unlock(pthread_mutex_t * mutex)
acquire(&mutex->m_spinlock);
switch (mutex->m_kind) {
case PTHREAD_MUTEX_FAST_NP:
- mutex->m_count = 0;
break;
case PTHREAD_MUTEX_RECURSIVE_NP:
- mutex->m_count--;
- if (mutex->m_count > 0) {
+ if (mutex->m_count >= 2) {
+ mutex->m_count--;
release(&mutex->m_spinlock);
return 0;
}
- mutex->m_count = 0; /* so that excess unlocks do not break everything */
break;
case PTHREAD_MUTEX_ERRORCHECK_NP:
if (mutex->m_count == 0 || mutex->m_owner != thread_self()) {
release(&mutex->m_spinlock);
return EPERM;
}
- mutex->m_count = 0;
break;
default:
release(&mutex->m_spinlock);
return EINVAL;
}
th = dequeue(&mutex->m_waiting);
+ /* If no waiters, unlock the mutex */
+ if (th == NULL) mutex->m_count = 0;
release(&mutex->m_spinlock);
- if (th != NULL) restart(th);
+ /* If there is a waiter, restart it with the mutex still locked */
+ if (th != NULL) {
+ mutex->m_owner = NULL; /* we no longer own the mutex */
+ restart(th);
+ }
return 0;
}
weak_alias (__pthread_mutex_unlock, pthread_mutex_unlock)