use monotonic time source in convar->timed_wait, and in the scheduler using it

configure.in

@@ -927,6 +927,20 @@ AC_TRY_COMPILE(
 	[AC_MSG_RESULT([no])]
 )
 
+dnl check if pthread_condattr_setclock(CLOCK_MONOTONE) is supported
+saved_LIBS=$LIBS
+LIBS="-lpthread"
+AC_MSG_CHECKING([for pthread_condattr_setclock(CLOCK_MONOTONE)])
+AC_TRY_RUN(
+	[#include <pthread.h>
+	 int main() { pthread_condattr_t attr;
+		pthread_condattr_init(&attr);
+		return pthread_condattr_setclock(&attr, CLOCK_MONOTONIC);}],
+	[AC_MSG_RESULT([yes]); AC_DEFINE([HAVE_CONDATTR_CLOCK_MONOTONIC])],
+	[AC_MSG_RESULT([no])]
+)
+LIBS=$saved_LIBS
+
 AC_CHECK_FUNCS(prctl)
 
 AC_CHECK_HEADERS(sys/sockio.h)

src/charon/processing/scheduler.c

@@ -190,7 +190,7 @@ static job_requeue_t schedule(private_scheduler_t * this)
 	
 	this->mutex->lock(this->mutex);
 	
-	gettimeofday(&now, NULL);
+	time_monotonic(&now);
 	
 	if ((event = peek_event(this)) != NULL)
 	{
@@ -290,7 +290,7 @@ static void schedule_job(private_scheduler_t *this, job_t *job, u_int32_t s)
 {
 	timeval_t tv;
 	
-	gettimeofday(&tv, NULL);
+	time_monotonic(&tv);
 	tv.tv_sec += s;
 	
 	schedule_job_tv(this, job, tv);
@@ -303,7 +303,7 @@ static void schedule_job_ms(private_scheduler_t *this, job_t *job, u_int32_t ms)
 {
 	timeval_t tv, add;
 	
-	gettimeofday(&tv, NULL);
+	time_monotonic(&tv);
 	add.tv_sec = ms / 1000;
 	add.tv_usec = (ms % 1000) * 1000;
 	

src/charon/processing/scheduler.h

@@ -101,6 +101,9 @@ struct scheduler_t {
 	/**
 	 * Adds a event to the queue, using an absolut time.
 	 *
+	 * The passed timeval should be calculated based on the time_monotonic()
+	 * function.
+	 *
 	 * @param job 			job to schedule
 	 * @param time 			absolut time to schedule job
 	 */

src/libstrongswan/utils.c

@@ -167,7 +167,9 @@ bool mkdir_p(const char *path, mode_t mode)
  */
 time_t time_monotonic(timeval_t *tv)
 {
-#if defined(HAVE_CLOCK_GETTIME)
+#if defined(HAVE_CLOCK_GETTIME) && defined(HAVE_CONDATTR_CLOCK_MONOTONIC)
+	/* as we use time_monotonic() for condvar operations, we use the
+	 * monotonic time source only if it is also supported by pthread. */
 	timespec_t ts;
 	
 	if (clock_gettime(CLOCK_MONOTONIC, &ts) == 0)
@@ -179,11 +181,12 @@ time_t time_monotonic(timeval_t *tv)
 		}
 		return ts.tv_sec;
 	}
-#endif /* HAVE_CLOCK_MONOTONIC */
+#endif /* HAVE_CLOCK_MONOTONIC && HAVE_CONDATTR_CLOCK_MONOTONIC */
 	/* Fallback to non-monotonic timestamps:
 	 * On MAC OS X, creating monotonic timestamps is rather difficult. We
 	 * could use mach_absolute_time() and catch sleep/wakeup notifications.
-	 * We stick to the simpler (non-monotonic) gettimeofday() for now. */
+	 * We stick to the simpler (non-monotonic) gettimeofday() for now.
+	 * But keep in mind: we need the same time source here as in condvar! */
 	if (!tv)
 	{
 		return time(NULL);

src/libstrongswan/utils/mutex.c

@@ -47,7 +47,7 @@ struct lock_profile_t {
 	/**
 	 * how long threads have waited for the lock in this mutex so far
 	 */
-	struct timeval waited;
+	timeval_t waited;
 	
 	/**
 	 * backtrace where mutex has been created
@@ -81,10 +81,10 @@ static void profiler_init(lock_profile_t *profile)
 
 #define profiler_start(profile) { \
 	struct timeval _start, _end, _diff; \
-	gettimeofday(&_start, NULL);
+	time_monotonic(&_start);
 	
 #define profiler_end(profile) \
-	gettimeofday(&_end, NULL); \
+	time_monotonic(&_end); \
 	timersub(&_end, &_start, &_diff); \
 	timeradd(&(profile)->waited, &_diff, &(profile)->waited); }
 
@@ -368,7 +368,7 @@ static bool timed_wait(private_condvar_t *this, private_mutex_t *mutex,
 	timeval_t tv;
 	u_int s, ms;
 	
-	gettimeofday(&tv, NULL);
+	time_monotonic(&tv);
 	
 	s = timeout / 1000;
 	ms = timeout % 1000;
@@ -419,17 +419,23 @@ condvar_t *condvar_create(condvar_type_t type)
 		case CONDVAR_TYPE_DEFAULT:
 		default:
 		{
+			pthread_condattr_t condattr;
 			private_condvar_t *this = malloc_thing(private_condvar_t);
-		
+			
 			this->public.wait = (void(*)(condvar_t*, mutex_t *mutex))_wait;
 			this->public.timed_wait = (bool(*)(condvar_t*, mutex_t *mutex, u_int timeout))timed_wait;
 			this->public.timed_wait_abs = (bool(*)(condvar_t*, mutex_t *mutex, timeval_t time))timed_wait_abs;
 			this->public.signal = (void(*)(condvar_t*))_signal;
 			this->public.broadcast = (void(*)(condvar_t*))broadcast;
 			this->public.destroy = (void(*)(condvar_t*))condvar_destroy;
-		
-			pthread_cond_init(&this->condvar, NULL);
-		
+			
+			pthread_condattr_init(&condattr);
+#ifdef HAVE_CONDATTR_CLOCK_MONOTONIC
+			pthread_condattr_setclock(&condattr, CLOCK_MONOTONIC);
+#endif
+			pthread_cond_init(&this->condvar, &condattr);
+			pthread_condattr_destroy(&condattr);
+			
 			return &this->public;
 		}
 	}

src/libstrongswan/utils/mutex.h

@@ -98,11 +98,11 @@ struct mutex_t {
 	 * Release the lock on the mutex.
 	 */
 	void (*unlock)(mutex_t *this);
-			
+	
 	/**
-     * Destroy a mutex instance.
-     */
-    void (*destroy)(mutex_t *this);
+	 * Destroy a mutex instance.
+	 */
+	void (*destroy)(mutex_t *this);
 };
 
 /**
@@ -128,12 +128,15 @@ struct condvar_t {
 	
 	/**
 	 * Wait on a condvar until it gets signalized, or times out.
-	 * 
+	 *
+	 * The passed timeval should be calculated based on the time_monotonic()
+	 * function.
+	 *
 	 * @param mutex			mutex to release while waiting
-	 * @param time			absolute time until timeout
+	 * @param tv			absolute time until timeout
 	 * @return				TRUE if timed out, FALSE otherwise
 	 */
-	bool (*timed_wait_abs)(condvar_t *this, mutex_t *mutex, timeval_t timeout);
+	bool (*timed_wait_abs)(condvar_t *this, mutex_t *mutex, timeval_t tv);
 	
 	/**
 	 * Wake up a single thread in a condvar.