get rid of obsolete mutexen and mutex/condvar attributes

src/child.c

@@ -150,6 +150,24 @@ sigflush(int sig)
 
 /*--------------------------------------------------------------------*/
 
+/* 
+ * the first test is not synced, so we might enter the if body too late or
+ * unnecessarily
+ *
+ * * too late: doesn't matter, will come back next time
+ * * unnecessarily: we'll find out now
+ */
+static inline void
+spmcq_signal(void)
+{
+    if (spmcq_datawaiter) {
+        AZ(pthread_mutex_lock(&spmcq_datawaiter_lock));
+        if (spmcq_datawaiter)
+            AZ(pthread_cond_signal(&spmcq_datawaiter_cond));
+        AZ(pthread_mutex_unlock(&spmcq_datawaiter_lock));
+    }
+}
+
 /* efficiently retrieve a single data entry */
 
 static inline dataentry
@@ -158,7 +176,7 @@ static inline dataentry
     dataentry *data;
 
     while (VSTAILQ_EMPTY(&reader_freelist)) {
-        spmcq_signal(data);
+        spmcq_signal();
         rdr_data_free = DATA_Take_Freelist(&reader_freelist);
         if (VSTAILQ_EMPTY(&reader_freelist)) {
             data_exhausted = 1;
@@ -200,19 +218,15 @@ data_submit(dataentry *de)
     SPMCQ_Enq(de);
     submitted++;
 
-    /* should we wake up another worker? */
-    wrk_running = WRK_Running();
-    if (SPMCQ_NeedWorker(wrk_running))
-        spmcq_signal(data);
-
-    /*
+    /* should we wake up another worker?
      * base case: wake up a worker if all are sleeping
      *
      * this is an un-synced access to spmcq_data_waiter, but
      * if we don't wake them up now, we will next time around
      */
-    if (wrk_running == spmcq_datawaiter)
-        spmcq_signal(data);
+    wrk_running = WRK_Running();
+    if (wrk_running == spmcq_datawaiter || SPMCQ_NeedWorker(wrk_running))
+        spmcq_signal();
 }
 
 static inline void

src/trackrdrd.h

@@ -165,40 +165,6 @@ dataentry *SPMCQ_Deq(void);
 void SPMCQ_Drain(void);
 unsigned SPMCQ_NeedWorker(int running);
 
-#define spmcq_wait(what)						\
-    do {								\
-        AZ(pthread_mutex_lock(&spmcq_##what##waiter_lock));		\
-        spmcq_##what##waiter++;                                         \
-        AZ(pthread_cond_wait(&spmcq_##what##waiter_cond,		\
-                &spmcq_##what##waiter_lock));                           \
-        spmcq_##what##waiter--;                                         \
-        AZ(pthread_mutex_unlock(&spmcq_##what##waiter_lock));           \
-    } while (0)
-
-/* 
- * the first test is not synced, so we might enter the if body too late or
- * unnecessarily
- *
- * * too late: doesn't matter, will come back next time
- * * unnecessarily: we'll find out now
- */
-
-#define spmcq_signal(what)						\
-    do {								\
-        if (spmcq_##what##waiter) {					\
-            AZ(pthread_mutex_lock(&spmcq_##what##waiter_lock));         \
-            if (spmcq_##what##waiter)                                   \
-                AZ(pthread_cond_signal(&spmcq_##what##waiter_cond));    \
-            AZ(pthread_mutex_unlock(&spmcq_##what##waiter_lock));	\
-        }								\
-    } while (0)
-
-/* Producer waits for this condition when the spmc queue is full.
-   Consumers signal this condition after dequeue. */
-pthread_cond_t  spmcq_roomwaiter_cond;
-pthread_mutex_t spmcq_roomwaiter_lock;
-int		spmcq_roomwaiter;
-
 /* Consumers wait for this condition when the spmc queue is empty.
    Producer signals this condition after enqueue. */
 pthread_cond_t  spmcq_datawaiter_cond;
@@ -322,7 +288,3 @@ typedef enum { VCL_LOG_DATA, VCL_LOG_KEY } vcl_log_t;
 int Parse_VCL_Log(const char *ptr, int len, char **data, int *datalen,
                   vcl_log_t *type);
 int Parse_Timestamp(const char *ptr, int len, struct timeval *t);
-
-/* generic init attributes */
-pthread_mutexattr_t attr_lock;
-pthread_condattr_t  attr_cond;

src/worker.c

@@ -193,8 +193,6 @@ wrk_send(void **mq_worker, dataentry *entry, worker_data_t *wrk)
         wrk->wrk_nfree = 0;
         assert(VSTAILQ_EMPTY(&wrk->wrk_freelist));
     }
-
-    spmcq_signal(room);
 }
 
 static void
@@ -307,8 +305,6 @@ static void wrk_cleanup(void)
     free(thread_data);
     AZ(pthread_mutex_destroy(&spmcq_datawaiter_lock));
     AZ(pthread_cond_destroy(&spmcq_datawaiter_cond));
-    AZ(pthread_mutex_destroy(&spmcq_roomwaiter_lock));
-    AZ(pthread_cond_destroy(&spmcq_roomwaiter_cond));
     cleaned = 1;
 }
 
@@ -345,10 +341,6 @@ WRK_Init(void)
     AZ(pthread_mutex_init(&spmcq_datawaiter_lock, NULL));
     AZ(pthread_cond_init(&spmcq_datawaiter_cond, NULL));
 
-    spmcq_roomwaiter = 0;
-    AZ(pthread_mutex_init(&spmcq_roomwaiter_lock, NULL));
-    AZ(pthread_cond_init(&spmcq_roomwaiter_cond, NULL));
-
     atexit(wrk_cleanup);
     return 0;
 }