[PATCH v1 3/4] perf mutex and cond: Updated files mutex.h & mutex.c

[gpavithrasha@gmail.com]

From: pavithra <gpavithrasha@gmail.com>

Added new struct and corresponding
functions to wrap usage of pthread_cond_t.
Added a new function for mutex_trylock-similar to
mutex_lock.

Signed-off-by: pavithra <gpavithrasha@gmail.com>
---
 tools/perf/util/mutex.c | 37 ++++++++++++++++++++++++++++++++-----
 tools/perf/util/mutex.h | 13 +++++++++++--
 2 files changed, 43 insertions(+), 7 deletions(-)

diff --git a/tools/perf/util/mutex.c b/tools/perf/util/mutex.c
index b7264a1438c4..9dc37a3f374f 100644
--- a/tools/perf/util/mutex.c
+++ b/tools/perf/util/mutex.c
@@ -1,8 +1,8 @@
 #include <mutex.h>
 #include <pthread.h>
 
-//to avoid the warning : implicit declaration of BUG_ON,
-//we add the following 2 headers.
+/*to avoid the warning : implicit declaration of BUG_ON*/
+/*we add the following 2 headers*/
 #include <linux/compiler.h>
 #include <linux/kernel.h>
 
@@ -11,14 +11,15 @@ void mutex_init(struct mutex *mtx)
 pthread_mutexattr_t lock_attr;
 pthread_mutexattr_init(&lock_attr);
 pthread_mutexattr_settype(&lock_attr, PTHREAD_MUTEX_ERRORCHECK);
-BUG_ON(pthread_mutex_init(&mtx->lock, &lock_attr));
-//on success, returns 0.
+/*pthread_mutex_init:on success, returns 0*/
+BUG_ON(pthread_mutex_init(&mtx->lock, &lock_attr));  
 pthread_mutexattr_destroy(&lock_attr);
 }
 
 void mutex_destroy(struct mutex *mtx)
 {
-BUG_ON(pthread_mutex_destroy(&mtx->lock));     //on success, returns 0.
+/*pthread_mutex_destroy:on success, returns 0*/
+BUG_ON(pthread_mutex_destroy(&mtx->lock));     
 }
 
 void mutex_lock(struct mutex *mtx)
@@ -30,3 +31,29 @@ void mutex_unlock(struct mutex *mtx)
 {
 BUG_ON(pthread_mutex_unlock(&mtx->lock) != 0);
 }
+
+bool mutex_trylock(struct mutex *mtx)
+{
+return pthread_mutex_trylock(&mtx->lock)!=0;
+}
+
+void cond_wait(struct cond *cnd, struct mutex *mtx)
+{
+BUG_ON(pthread_cond_wait(&cnd->cond, &mtx->lock) != 0);
+}
+
+void cond_signal(struct cond *cnd)
+{
+BUG_ON(pthread_cond_signal(&cnd->cond) != 0);
+}
+
+void cond_init(struct cond *cnd)
+{
+pthread_condattr_t attr;
+
+pthread_condattr_init(&attr);
+
+/*pthread_cond_init:on success, returns 0*/
+BUG_ON(pthread_cond_init(&cnd->cond, &attr));
+pthread_condattr_destroy(&attr);
+}
diff --git a/tools/perf/util/mutex.h b/tools/perf/util/mutex.h
index ab2ebb98b24a..f1b4aaa151be 100644
--- a/tools/perf/util/mutex.h
+++ b/tools/perf/util/mutex.h
@@ -1,15 +1,24 @@
 #ifndef __PERF_MUTEX_H
-#define _PERF_MUTEX_H
+#define __PERF_MUTEX_H
 
 #include <pthread.h>
+#include <stdbool.h>
 
 struct mutex {
 pthread_mutex_t lock;
 };
 
+struct cond {
+pthread_cond_t cond;
+};
+
 void mutex_lock(struct mutex *mtx);
 void mutex_unlock(struct mutex *mtx);
+bool mutex_trylock(struct mutex *mtx);
 void mutex_init(struct mutex *mtx);
 void mutex_destroy(struct mutex *mtx);
 
-#endif /* _PERF_MUTEX_H */
+void cond_wait(struct cond *cnd, struct mutex *mtx);
+void cond_signal(struct cond *cnd);
+void cond_init(struct cond *cnd);
+#endif /* __PERF_MUTEX_H */
-- 
2.25.1