Move liblttng-ust-pthread-wrapper to 'src/lib/'

[lttng-ust.git] / src / lib / lttng-ust-pthread-wrapper / lttng-ust-pthread.c

diff --git a/src/lib/lttng-ust-pthread-wrapper/lttng-ust-pthread.c b/src/lib/lttng-ust-pthread-wrapper/lttng-ust-pthread.c
new file mode 100644 (file)
index 0000000..c6633fe
--- /dev/null
+++ b/src/lib/lttng-ust-pthread-wrapper/lttng-ust-pthread.c
@@ -0,0 +1,107 @@
+/*
+ * SPDX-License-Identifier: LGPL-2.1-or-later
+ *
+ * Copyright (C) 2013  Mentor Graphics
+ */
+
+/*
+ * Do _not_ define _LGPL_SOURCE because we don't want to create a
+ * circular dependency loop between this malloc wrapper, liburcu and
+ * libc.
+ */
+
+/* Has to be included first to override dlfcn.h */
+#include <common/compat/dlfcn.h>
+
+#include "common/macros.h"
+#include <pthread.h>
+
+#define TRACEPOINT_DEFINE
+#define TRACEPOINT_CREATE_PROBES
+#define TP_IP_PARAM ip
+#include "ust_pthread.h"
+
+static __thread int thread_in_trace;
+
+int pthread_mutex_lock(pthread_mutex_t *mutex)
+{
+       static int (*mutex_lock)(pthread_mutex_t *);
+       int retval;
+
+       if (!mutex_lock) {
+               mutex_lock = dlsym(RTLD_NEXT, "pthread_mutex_lock");
+               if (!mutex_lock) {
+                       if (thread_in_trace) {
+                               abort();
+                       }
+                       fprintf(stderr, "unable to initialize pthread wrapper library.\n");
+                       return EINVAL;
+               }
+       }
+       if (thread_in_trace) {
+               return mutex_lock(mutex);
+       }
+
+       thread_in_trace = 1;
+       tracepoint(lttng_ust_pthread, pthread_mutex_lock_req, mutex,
+               LTTNG_UST_CALLER_IP());
+       retval = mutex_lock(mutex);
+       tracepoint(lttng_ust_pthread, pthread_mutex_lock_acq, mutex,
+               retval, LTTNG_UST_CALLER_IP());
+       thread_in_trace = 0;
+       return retval;
+}
+
+int pthread_mutex_trylock(pthread_mutex_t *mutex)
+{
+       static int (*mutex_trylock)(pthread_mutex_t *);
+       int retval;
+
+       if (!mutex_trylock) {
+               mutex_trylock = dlsym(RTLD_NEXT, "pthread_mutex_trylock");
+               if (!mutex_trylock) {
+                       if (thread_in_trace) {
+                               abort();
+                       }
+                       fprintf(stderr, "unable to initialize pthread wrapper library.\n");
+                       return EINVAL;
+               }
+       }
+       if (thread_in_trace) {
+               return mutex_trylock(mutex);
+       }
+
+       thread_in_trace = 1;
+       retval = mutex_trylock(mutex);
+       tracepoint(lttng_ust_pthread, pthread_mutex_trylock, mutex,
+               retval, LTTNG_UST_CALLER_IP());
+       thread_in_trace = 0;
+       return retval;
+}
+
+int pthread_mutex_unlock(pthread_mutex_t *mutex)
+{
+       static int (*mutex_unlock)(pthread_mutex_t *);
+       int retval;
+
+       if (!mutex_unlock) {
+               mutex_unlock = dlsym(RTLD_NEXT, "pthread_mutex_unlock");
+               if (!mutex_unlock) {
+                       if (thread_in_trace) {
+                               abort();
+                       }
+                       fprintf(stderr, "unable to initialize pthread wrapper library.\n");
+                       return EINVAL;
+               }
+       }
+       if (thread_in_trace) {
+               return mutex_unlock(mutex);
+       }
+
+       thread_in_trace = 1;
+       retval = mutex_unlock(mutex);
+       tracepoint(lttng_ust_pthread, pthread_mutex_unlock, mutex,
+               retval, LTTNG_UST_CALLER_IP());
+       thread_in_trace = 0;
+       return retval;
+}