Compile with -std=gnu99.

Small cleanups

SConstruct

@@ -54,7 +54,7 @@ env = Environment(tools = ['default', 'textfile'])
 env.AddMethod(InstallPerm)
 Export('env', 'build_type', 'prefix', 'version_info', 'test_xml')
 
-env.Append(CFLAGS = ['-Wall', '-Wextra', '-Wundef', '-Wcast-qual','-Wshadow' ,'-Wcast-align','-pipe', '-ggdb', '-pthread'])
+env.Append(CFLAGS = ['-std=gnu99','-Wall', '-Wextra', '-Wundef', '-Wcast-qual','-Wshadow' ,'-Wcast-align','-pipe', '-ggdb', '-pthread'])
 env.Append(LINKFLAGS = ['-O2', '-pthread'])
 env.Append(CPPDEFINES = ['_FILE_OFFSET_BITS=64'])
 env.Append(CPPPATH = ['#include'])

src/ucore_threadqueue.c

@@ -9,7 +9,8 @@
  * @param timeout a timeout duration
  * @param result the absolute time from now when the timeout expires
  */
-void uc_get_absolute_time(struct timespec *result, const struct timespec *timeout) 
+static inline void uc_get_absolute_time(struct timespec *result, 
+                                        const struct timespec *timeout) 
 {
     struct timeval now;
     //TODO investigate using clock_gettime() instead of gettimeofday
@@ -53,12 +54,15 @@ int uc_thread_queue_init(struct uc_threadqueue *queue, long max_elements)
     queue->max_elements = max_elements;
     queue->last = &queue->first;
 
-    return 0;
+    return rc;
-
 }
 
 int uc_thread_queue_add(struct uc_threadqueue *queue, struct uc_threadmsg *msg)
 {
+    if (queue == NULL || msg == NULL) {
+        return EINVAL;
+    }
+
     pthread_mutex_lock(&queue->mutex);
 
     //Wait if the queue is full
@@ -81,6 +85,8 @@ int uc_thread_queue_add(struct uc_threadqueue *queue, struct uc_threadmsg *msg)
         queue->first = msg;
     }
 
+    queue->num_elements++;
+
     //signal blocked readers
 	if (queue->num_read_waiters == 1) {
         //if there's just one thread waiting to pop elements
@@ -91,7 +97,6 @@ int uc_thread_queue_add(struct uc_threadqueue *queue, struct uc_threadmsg *msg)
 		pthread_cond_broadcast(&queue->read_cond);
     }
 
-    queue->num_elements++;
 
     pthread_mutex_unlock(&queue->mutex);
 
@@ -184,7 +189,6 @@ int uc_thread_queue_walk(struct uc_threadqueue *queue, uc_thread_queue_walk_func
     return 0;
 }
 
-//maybe caller should supply a callback for cleaning the elements ?
 int uc_thread_queue_destroy(struct uc_threadqueue *queue, uc_thread_queue_walk_func free_func)
 {
     int rc;
@@ -223,6 +227,10 @@ int uc_thread_queue_destroy(struct uc_threadqueue *queue, uc_thread_queue_walk_f
 long uc_thread_queue_length(struct uc_threadqueue *queue)
 {
     long length;
+
+    if (queue == NULL ) {
+        return -EINVAL;
+    }
     // get the length properly
     pthread_mutex_lock(&queue->mutex);
     length = queue->num_elements;