b=18728 allow queued write syscall termination by a signal

[fs/lustre-release.git] / libcfs / libcfs / user-lock.c

diff --git a/libcfs/libcfs/user-lock.c b/libcfs/libcfs/user-lock.c
index ab4447c..81d5a11 100644 (file)
--- a/libcfs/libcfs/user-lock.c
+++ b/libcfs/libcfs/user-lock.c
@@ -26,7 +26,7 @@
  * GPL HEADER END
  */
 /*
- * Copyright  2008 Sun Microsystems, Inc. All rights reserved
+ * Copyright (c) 2008, 2010, Oracle and/or its affiliates. All rights reserved.
  * Use is subject to license terms.
  */
 /*
@@ -71,41 +71,41 @@
  * No-op implementation.
  */
 
-void spin_lock_init(spinlock_t *lock)
+void cfs_spin_lock_init(cfs_spinlock_t *lock)
 {
         LASSERT(lock != NULL);
         (void)lock;
 }
 
-void spin_lock(spinlock_t *lock)
+void cfs_spin_lock(cfs_spinlock_t *lock)
 {
         (void)lock;
 }
 
-void spin_unlock(spinlock_t *lock)
+void cfs_spin_unlock(cfs_spinlock_t *lock)
 {
         (void)lock;
 }
 
-int spin_trylock(spinlock_t *lock)
+int cfs_spin_trylock(cfs_spinlock_t *lock)
 {
         (void)lock;
        return 1;
 }
 
-void spin_lock_bh_init(spinlock_t *lock)
+void cfs_spin_lock_bh_init(cfs_spinlock_t *lock)
 {
         LASSERT(lock != NULL);
         (void)lock;
 }
 
-void spin_lock_bh(spinlock_t *lock)
+void cfs_spin_lock_bh(cfs_spinlock_t *lock)
 {
         LASSERT(lock != NULL);
         (void)lock;
 }
 
-void spin_unlock_bh(spinlock_t *lock)
+void cfs_spin_unlock_bh(cfs_spinlock_t *lock)
 {
         LASSERT(lock != NULL);
         (void)lock;
@@ -119,20 +119,27 @@ void spin_unlock_bh(spinlock_t *lock)
  * - __up(x)
  */
 
-void sema_init(struct semaphore *s, int val)
+void cfs_sema_init(cfs_semaphore_t *s, int val)
 {
         LASSERT(s != NULL);
         (void)s;
         (void)val;
 }
 
-void __down(struct semaphore *s)
+void __down(cfs_semaphore_t *s)
 {
         LASSERT(s != NULL);
         (void)s;
 }
 
-void __up(struct semaphore *s)
+int __down_interruptible(cfs_semaphore_t *s)
+{
+        LASSERT(s != NULL);
+        (void)s;
+        return 0;
+}
+
+void __up(cfs_semaphore_t *s)
 {
         LASSERT(s != NULL);
         (void)s;
@@ -147,45 +154,48 @@ void __up(struct semaphore *s)
  * - wait_for_completion(c)
  */
 
-static cfs_wait_handler *wait_handler;
+static cfs_wait_handler_t wait_handler;
 
-void init_completion_module(cfs_wait_handler *handler)
+void cfs_init_completion_module(cfs_wait_handler_t handler)
 {
         wait_handler = handler;
 }
 
-void init_completion(struct completion *c)
+int cfs_call_wait_handler(int timeout)
+{
+        if (!wait_handler)
+                return -ENOSYS;
+        return wait_handler(timeout);
+}
+
+void cfs_init_completion(cfs_completion_t *c)
 {
         LASSERT(c != NULL);
         c->done = 0;
         cfs_waitq_init(&c->wait);
 }
 
-void complete(struct completion *c)
+void cfs_complete(cfs_completion_t *c)
 {
         LASSERT(c != NULL);
         c->done  = 1;
         cfs_waitq_signal(&c->wait);
 }
 
-void wait_for_completion(struct completion *c)
+void cfs_wait_for_completion(cfs_completion_t *c)
 {
         LASSERT(c != NULL);
         do {
-                if (wait_handler) 
-                        wait_handler(1000);
-                else
+                if (cfs_call_wait_handler(1000) < 0)
                         break;
         } while (c->done == 0);
 }
 
-int wait_for_completion_interruptible(struct completion *c)
+int cfs_wait_for_completion_interruptible(cfs_completion_t *c)
 {
         LASSERT(c != NULL);
         do {
-                if (wait_handler) 
-                        wait_handler(1000);
-                else
+                if (cfs_call_wait_handler(1000) < 0)
                         break;
         } while (c->done == 0);
         return 0;
@@ -202,45 +212,51 @@ int wait_for_completion_interruptible(struct completion *c)
  * - up_write(x)
  */
 
-void init_rwsem(struct rw_semaphore *s)
+void cfs_init_rwsem(cfs_rw_semaphore_t *s)
 {
         LASSERT(s != NULL);
         (void)s;
 }
 
-void down_read(struct rw_semaphore *s)
+void cfs_down_read(cfs_rw_semaphore_t *s)
 {
         LASSERT(s != NULL);
         (void)s;
 }
 
-int down_read_trylock(struct rw_semaphore *s)
+int cfs_down_read_trylock(cfs_rw_semaphore_t *s)
 {
         LASSERT(s != NULL);
         (void)s;
        return 1;
 }
 
-void down_write(struct rw_semaphore *s)
+void cfs_down_write(cfs_rw_semaphore_t *s)
 {
         LASSERT(s != NULL);
         (void)s;
 }
 
-int down_write_trylock(struct rw_semaphore *s)
+int cfs_down_write_trylock(cfs_rw_semaphore_t *s)
 {
         LASSERT(s != NULL);
         (void)s;
        return 1;
 }
 
-void up_read(struct rw_semaphore *s)
+void cfs_up_read(cfs_rw_semaphore_t *s)
+{
+        LASSERT(s != NULL);
+        (void)s;
+}
+
+void cfs_up_write(cfs_rw_semaphore_t *s)
 {
         LASSERT(s != NULL);
         (void)s;
 }
 
-void up_write(struct rw_semaphore *s)
+void cfs_fini_rwsem(cfs_rw_semaphore_t *s)
 {
         LASSERT(s != NULL);
         (void)s;
@@ -249,10 +265,10 @@ void up_write(struct rw_semaphore *s)
 #ifdef HAVE_LIBPTHREAD
 
 /*
- * Completion
+ * Multi-threaded user space completion
  */
 
-void cfs_init_completion(struct cfs_completion *c)
+void cfs_mt_init_completion(cfs_mt_completion_t *c)
 {
         LASSERT(c != NULL);
         c->c_done = 0;
@@ -260,14 +276,14 @@ void cfs_init_completion(struct cfs_completion *c)
         pthread_cond_init(&c->c_cond, NULL);
 }
 
-void cfs_fini_completion(struct cfs_completion *c)
+void cfs_mt_fini_completion(cfs_mt_completion_t *c)
 {
         LASSERT(c != NULL);
         pthread_mutex_destroy(&c->c_mut);
         pthread_cond_destroy(&c->c_cond);
 }
 
-void cfs_complete(struct cfs_completion *c)
+void cfs_mt_complete(cfs_mt_completion_t *c)
 {
         LASSERT(c != NULL);
         pthread_mutex_lock(&c->c_mut);
@@ -276,7 +292,7 @@ void cfs_complete(struct cfs_completion *c)
         pthread_mutex_unlock(&c->c_mut);
 }
 
-void cfs_wait_for_completion(struct cfs_completion *c)
+void cfs_mt_wait_for_completion(cfs_mt_completion_t *c)
 {
         LASSERT(c != NULL);
         pthread_mutex_lock(&c->c_mut);
@@ -287,12 +303,12 @@ void cfs_wait_for_completion(struct cfs_completion *c)
 }
 
 /*
- * atomic primitives
+ * Multi-threaded user space atomic primitives
  */
 
 static pthread_mutex_t atomic_guard_lock = PTHREAD_MUTEX_INITIALIZER;
 
-int cfs_atomic_read(cfs_atomic_t *a)
+int cfs_mt_atomic_read(cfs_mt_atomic_t *a)
 {
         int r;
 
@@ -302,14 +318,14 @@ int cfs_atomic_read(cfs_atomic_t *a)
         return r;
 }
 
-void cfs_atomic_set(cfs_atomic_t *a, int b)
+void cfs_mt_atomic_set(cfs_mt_atomic_t *a, int b)
 {
         pthread_mutex_lock(&atomic_guard_lock);
         a->counter = b;
         pthread_mutex_unlock(&atomic_guard_lock);
 }
 
-int cfs_atomic_dec_and_test(cfs_atomic_t *a)
+int cfs_mt_atomic_dec_and_test(cfs_mt_atomic_t *a)
 {
         int r;
 
@@ -319,20 +335,20 @@ int cfs_atomic_dec_and_test(cfs_atomic_t *a)
         return (r == 0);
 }
 
-void cfs_atomic_inc(cfs_atomic_t *a)
+void cfs_mt_atomic_inc(cfs_mt_atomic_t *a)
 {
         pthread_mutex_lock(&atomic_guard_lock);
         ++a->counter;
         pthread_mutex_unlock(&atomic_guard_lock);
 }
 
-void cfs_atomic_dec(cfs_atomic_t *a)
+void cfs_mt_atomic_dec(cfs_mt_atomic_t *a)
 {
         pthread_mutex_lock(&atomic_guard_lock);
         --a->counter;
         pthread_mutex_unlock(&atomic_guard_lock);
 }
-void cfs_atomic_add(int b, cfs_atomic_t *a)
+void cfs_mt_atomic_add(int b, cfs_mt_atomic_t *a)
 
 {
         pthread_mutex_lock(&atomic_guard_lock);
@@ -340,7 +356,7 @@ void cfs_atomic_add(int b, cfs_atomic_t *a)
         pthread_mutex_unlock(&atomic_guard_lock);
 }
 
-void cfs_atomic_sub(int b, cfs_atomic_t *a)
+void cfs_mt_atomic_sub(int b, cfs_mt_atomic_t *a)
 {
         pthread_mutex_lock(&atomic_guard_lock);
         a->counter -= b;