Use new libosmocore logging lock API

Since libosmocore Id7711893b34263baacac6caf4d489467053131bb, a new API
log_enable_multithread() is available which takes care of protecting
logging infrastructure from us (and actually does it correctly since we
cannot protect internal libosmocore structures from osmo-trx).

Let's drop all mutex related code from osmo-trx logging infra and simply
rely on libosmocore's.

Related: OS#4088
Change-Id: I519d0f30bce871005ca26b90177ea4aa4839360a

CommonLibs/Logger.cpp

@@ -48,9 +48,11 @@ Log::~Log()
 	int neednl = (mlen==0 || mStream.str()[mlen-1] != '\n');
 	const char *fmt = neednl ? "%s\n" : "%s";
 
-	log_mutex_lock_canceldisable(&old_state);
+	/* print related function called inside a C++ destructor, use pthread_setcancelstate() APIs.
+	   See osmo-trx commit 86be40b4eb762d5c12e8e3f7388ca9f254e77b36 for more information */
+	pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &old_state);
 	LOGPSRC(mCategory, mPriority, filename, line, fmt, mStream.str().c_str());
-	log_mutex_unlock_canceldisable(old_state);
+	pthread_setcancelstate(old_state, NULL);
 }
 
 ostringstream& Log::get()

CommonLibs/debug.c

@@ -59,49 +59,3 @@ const struct log_info log_info = {
 	.cat = default_categories,
 	.num_cat = ARRAY_SIZE(default_categories),
 };
-
-pthread_mutex_t log_mutex;
-
-bool log_mutex_init() {
-	int rc;
-	pthread_mutexattr_t attr;
-
-	if ((rc = pthread_mutexattr_init(&attr))) {
-		fprintf(stderr, "pthread_mutexattr_init() failed: %d\n", rc);
-		return false;
-	}
-	if ((rc = pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE))) {
-		fprintf(stderr, "pthread_mutexattr_settype() failed: %d\n", rc);
-		return false;
-	}
-	if ((rc = pthread_mutex_init(&log_mutex, &attr))) {
-		fprintf(stderr, "pthread_mutex_init() failed: %d\n", rc);
-		return false;
-	}
-	if ((rc = pthread_mutexattr_destroy(&attr))) {
-		fprintf(stderr, "pthread_mutexattr_destroy() failed: %d\n", rc);
-		return false;
-	}
-	return true;
-	/* FIXME: do we need to call pthread_mutex_destroy() during process exit? */
-}
-
-/* If called inside a C++ destructor, use log_mutex_(un)lock_canceldisable() APIs instead.
-   See osmo-trx commit 86be40b4eb762d5c12e8e3f7388ca9f254e77b36 for more information */
-void log_mutex_lock() {
-	OSMO_ASSERT(!pthread_mutex_lock(&log_mutex));
-}
-
-void log_mutex_unlock() {
-	OSMO_ASSERT(!pthread_mutex_unlock(&log_mutex));
-}
-
-void log_mutex_lock_canceldisable(int *st) {
-	pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, st);
-	log_mutex_lock();
-}
-
-void log_mutex_unlock_canceldisable(int st) {
-	log_mutex_unlock();
-	pthread_setcancelstate(st, NULL);
-}

CommonLibs/debug.h

@@ -15,21 +15,10 @@ enum {
 	DLMS,
 };
 
-
-bool log_mutex_init();
-void log_mutex_lock();
-void log_mutex_unlock();
-void log_mutex_lock_canceldisable(int *st);
-void log_mutex_unlock_canceldisable(int st);
-
 #define CLOGC(category, level, fmt, args...) do { \
-	log_mutex_lock(); \
 	LOGP(category, level, "[tid=%lu] " fmt, pthread_self(), ##args);  \
-	log_mutex_unlock(); \
 } while(0)
 
 #define CLOGCHAN(chan, category, level, fmt, args...) do { \
-	log_mutex_lock(); \
 	LOGP(category, level, "[tid=%lu][chan=%lu] " fmt, pthread_self(), chan, ##args);  \
-	log_mutex_unlock(); \
 } while(0)

Transceiver52M/osmo-trx.cpp

@@ -576,14 +576,11 @@ int main(int argc, char *argv[])
 	printf("Built without atomic operation support. Using Mutex, it may affect performance!\n");
 #endif
 
-	if (!log_mutex_init()) {
-		fprintf(stderr, "Failed to initialize log mutex!\n");
-		exit(2);
-	}
 	convolve_init();
 	convert_init();
 
 	osmo_init_logging2(tall_trx_ctx, &log_info);
+	log_enable_multithread();
 	osmo_stats_init(tall_trx_ctx);
 	vty_init(&g_vty_info);
 	ctrl_vty_init(tall_trx_ctx);