From a420994fe53199747e6d0ba0af473ecc4f940258 Mon Sep 17 00:00:00 2001
From: deva <deva>
Date: Thu, 28 Apr 2005 18:11:58 +0000
Subject: Moved mutex into queue (made it thread safe), to avoid mutex locking
 in player, encoder and decoder.

---
 src/queue.h | 69 +++++++++++++++++++++++++++++++++++++++++++++++++------------
 1 file changed, 56 insertions(+), 13 deletions(-)

(limited to 'src/queue.h')

diff --git a/src/queue.h b/src/queue.h
index 1cd0a3c..5e6d0f8 100644
--- a/src/queue.h
+++ b/src/queue.h
@@ -1,3 +1,4 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
 /*
  * RTVideoRec Realtime video recoder and encoder for Linux
  *
@@ -30,6 +31,7 @@
 #include <avformat.h>
 #include <avcodec.h>
 
+#include "thread.h"
 #include "util.h"
 
 typedef struct __buf_t {
@@ -41,7 +43,7 @@ typedef struct __buf_t {
 
 template<typename T>
 class Queue {
- public:
+public:
   Queue(int glimit = 0);
   ~Queue();
 
@@ -50,49 +52,56 @@ class Queue {
   
   void plength();
 
- private:
+private:
   int limit;
   buf_t *head;
   buf_t *tail;
   int count;
   pthread_mutex_t mutex;
+  T *_pop();
 };
 
-template<typename T>
-void Queue<T>::plength()
-{
-  fprintf(stderr, "[ql: %d]", count);
-  fflush(stderr);
-}
-
+/**
+ * Initialize queue
+ */
 template<typename T>
 Queue<T>::Queue(int glimit)
 {
+  pthread_mutex_init (&mutex, NULL);
   limit = glimit;
   count = 0;
   head = NULL;
   tail = NULL;
 }
 
+/**
+ * Clean up queue.
+ */
 template<typename T>
 Queue<T>::~Queue()
-{
+{ 
   if(count != 0) {
     fprintf(stderr, "Queue not empty (%d)\n", count);
-    while(T *t = pop()) delete t;
+    while(T *t = _pop()) delete t;
   }
+  pthread_mutex_destroy(&mutex);
 }
 
+/**
+ * Push element on queue.
+ */
 template<typename T>
 void Queue<T>::push(T *t)
 {
+  pthread_mutex_lock(&mutex);
+
   buf_t *b = (buf_t*)xmalloc(sizeof(*b));
   b->data = (void*)t;
 
   assert(b != NULL);
   
   if(limit && count > 0) {
-    T* tmp = (T*)pop();
+    T* tmp = (T*)_pop();
     delete tmp;
   }
   
@@ -100,6 +109,7 @@ void Queue<T>::push(T *t)
     head = tail = b;
     b->next = b->prev = NULL;
     count = 1;
+    pthread_mutex_unlock(&mutex);
     return;
   }
   
@@ -109,18 +119,38 @@ void Queue<T>::push(T *t)
     tail->prev = b;
   tail = b;
   count++;
+  
+  pthread_mutex_unlock(&mutex);
 }
 
+/**
+ * Pop element from queue.
+ * If queue is empty, NULL is returned.
+ */
 template<typename T>
 T *Queue<T>::pop()
+{
+  pthread_mutex_lock(&mutex);
+  T *d = _pop();
+  pthread_mutex_unlock(&mutex);
+  return d;
+}
+
+/**
+ * Pop helper method
+ * If queue is empty, NULL is returned.
+ */
+template<typename T>
+T *Queue<T>::_pop()
 {
   T *d;
   buf_t *b;
 
   assert(count >= 0);
   
-  if(count == 0)
+  if(count == 0) {
     return NULL;
+  }
   
   b = head;
   if(b->prev)
@@ -132,8 +162,21 @@ T *Queue<T>::pop()
   
   d = (T*)b->data;
   free(b);
+  
   return d;
 }
 
+/**
+ * Print current length of queue
+ */
+template<typename T>
+void Queue<T>::plength()
+{
+  pthread_mutex_lock(&mutex);
+  fprintf(stderr, "[ql: %d]", count);
+  fflush(stderr);
+  pthread_mutex_unlock(&mutex);
+}
+
 #endif
 
-- 
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