>From 72434f142926540ec63e8ee772936172731dec72 Mon Sep 17 00:00:00 2001
From: Yu Ning <ning.yu@xxxxxxxxxx>
Date: Wed, 16 Sep 2015 18:12:50 +0800
Subject: [PATCH 2/3] Use monotonic clock for pthread cond timed wait.
The default PTHREAD_COND_INITIALIZER initializer uses realtime clock,
we need to switch to use the monotic clock.
---
lib/alarm.c | 13 ++++++++++++-
1 file changed, 12 insertions(+), 1 deletion(-)
diff --git a/lib/alarm.c b/lib/alarm.c
index 65a80ae..5b98b2d 100755
--- a/lib/alarm.c
+++ b/lib/alarm.c
@@ -23,7 +23,7 @@ struct alarm {
};
static pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER;
-static pthread_cond_t cond = PTHREAD_COND_INITIALIZER;
+static pthread_cond_t cond;
static LIST_HEAD(alarms);
#define alarm_lock() \
@@ -212,6 +212,7 @@ int alarm_start_handler(void)
pthread_t thid;
pthread_attr_t attrs;
pthread_attr_t *pattrs = &attrs;
+ pthread_condattr_t condattrs;
int status;
status = pthread_attr_init(pattrs);
@@ -224,8 +225,18 @@ int alarm_start_handler(void)
#endif
}
+ status = pthread_condattr_init(&condattrs);
+ if (status)
+ fatal(status);
+
+ pthread_condattr_setclock(&condattrs, CLOCK_MONOTONIC);
+ pthread_cond_init(&cond, &condattrs);
+
status = pthread_create(&thid, pattrs, alarm_handler, NULL);
+ pthread_condattr_destroy(&condattrs);
+ pthread_condattr_destroy(&cond);
+
if (pattrs)
pthread_attr_destroy(pattrs);
--
1.9.1
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