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hw/buffer_lock.c

@@ -0,0 +1,80 @@
+#include "hw/buffer_lock.h"
+
+bool buffer_lock_is_used(buffer_lock_t *buf_lock)
+{
+  int refs = 0;
+
+  pthread_mutex_lock(&buf_lock->lock);
+  refs = buf_lock->refs;
+  pthread_mutex_unlock(&buf_lock->lock);
+
+  return refs;
+}
+
+void buffer_lock_use(buffer_lock_t *buf_lock, int ref)
+{
+  pthread_mutex_lock(&buf_lock->lock);
+  buf_lock->refs += ref;
+  pthread_mutex_unlock(&buf_lock->lock);
+}
+
+bool buffer_lock_needs_buffer(buffer_lock_t *buf_lock)
+{
+  struct timeval now;
+  gettimeofday(&now, NULL);
+  bool needs_buffer = false;
+
+  pthread_mutex_lock(&buf_lock->lock);
+  if (now.tv_sec - buf_lock->buf_time.tv_sec > 1) {
+    buffer_consumed(buf_lock->buf);
+    buf_lock->buf = NULL;
+    needs_buffer = true;
+  }
+  if (buf_lock->refs > 0) {
+    needs_buffer = true;
+  }
+  pthread_mutex_unlock(&buf_lock->lock);
+
+  return needs_buffer;
+}
+
+void buffer_lock_capture(buffer_lock_t *buf_lock, buffer_t *buf)
+{
+  pthread_mutex_lock(&buf_lock->lock);
+  buffer_consumed(buf_lock->buf);
+  buffer_use(buf);
+  buf_lock->buf = buf;
+  buf_lock->counter++;
+  gettimeofday(&buf_lock->buf_time, NULL);
+  E_LOG_DEBUG(buf_lock, "Captured HTTP snapshot: %d", buf_lock->counter);
+  pthread_cond_broadcast(&buf_lock->cond_wait);
+  pthread_mutex_unlock(&buf_lock->lock);
+}
+
+buffer_t *buffer_lock_get(buffer_lock_t *buf_lock, int timeout_s, int *counter)
+{
+  buffer_t *buf = NULL;
+  struct timeval now;
+  struct timespec timeout;
+  gettimeofday(&now, NULL);
+  timeout.tv_nsec = now.tv_usec;
+  timeout.tv_sec = now.tv_sec + timeout_s;
+
+  pthread_mutex_lock(&buf_lock->lock);
+  if (*counter == buf_lock->counter || !buf_lock->buf) {
+    int ret = pthread_cond_timedwait(&buf_lock->cond_wait, &buf_lock->lock, &timeout);
+    if (ret == ETIMEDOUT) {
+      goto ret;
+    } else if (ret < 0) {
+      goto ret;
+    }
+  }
+
+  buf = buf_lock->buf;
+  buffer_use(buf);
+  *counter = buf_lock->counter;
+
+ret:
+  pthread_mutex_unlock(&buf_lock->lock);
+  return buf;
+}