Merge CV, ver=5.1; ops/methods from HV, and interface from CV where possible

[goodguy/history.git] / cinelerra-5.1 / db / thr.h

diff --git a/cinelerra-5.1/db/thr.h b/cinelerra-5.1/db/thr.h
new file mode 100644 (file)
index 0000000..1feb234
--- /dev/null
+++ b/cinelerra-5.1/db/thr.h
@@ -0,0 +1,88 @@
+#ifndef __THR_H__
+#define __THR_H__
+#include <cstdio>
+#include <stdlib.h>
+#include <signal.h>
+#include <pthread.h>
+
+class Mutex;
+class Condition;
+
+class Mutex {
+  pthread_mutex_t mutex;
+public:
+  friend class Condition;
+  Mutex() { pthread_mutex_init(&mutex, 0); }
+  ~Mutex() { pthread_mutex_destroy(&mutex); }
+  int lock() { return pthread_mutex_lock(&mutex); }
+  int trylock() { return pthread_mutex_trylock(&mutex); }
+  int unlock() { return pthread_mutex_unlock(&mutex); }
+  void reset() { pthread_mutex_destroy(&mutex); pthread_mutex_init(&mutex,0); }
+};
+
+class Condition : public Mutex {
+  pthread_cond_t cond;
+  int init_v;
+  volatile int v;
+public:
+  int lock() {
+    Mutex::lock();  while(v <= 0) pthread_cond_wait(&cond, &mutex);
+    --v;  Mutex::unlock(); return 0;
+  }
+  void unlock() { Mutex::lock(); ++v; pthread_cond_signal(&cond); Mutex::unlock(); }
+  Condition(int iv=1) : init_v(iv) {
+    v = init_v;  pthread_cond_init(&cond, NULL);
+  }
+  ~Condition() { pthread_cond_destroy(&cond); }
+  void reset() {
+    pthread_cond_destroy(&cond); pthread_cond_init(&cond, NULL);
+    Mutex::reset();  v = 1;
+  }
+};
+
+class Thread {
+private:
+  int started, active;
+  pthread_t owner_tid, tid;
+public:
+  virtual void run() = 0;
+  static void *proc(void *t) { ((Thread*)t)->run(); return 0; }
+  pthread_t owner() { return owner_tid; }
+  pthread_t self() { return tid; }
+  int running() { return active; }
+  int cancel() {
+    if( started ) { started = 0; pthread_cancel(tid); }
+    return 0;
+  }
+  void start() {
+    started = active = 1;
+    pthread_create(&tid, 0, proc,(void*)this);
+  }
+  void join() { if( active ) { pthread_join(tid, 0); active = 0; } }
+  void pause() { pthread_kill(tid, SIGSTOP); }
+  void resume() { pthread_kill(tid, SIGCONT); }
+  Thread() { started = active = 0; owner_tid = pthread_self(); }
+  virtual ~Thread() {}
+
+};
+
+// old stuff
+
+class thread : public Thread {
+  int done;
+  Condition ready;
+public:
+  thread() { done = 0;  ready.lock();  start(); }
+  ~thread() { Kill(); }
+
+  virtual void Proc () = 0;
+  void run() { while( !done ) { ready.lock(); if( !done ) Proc(); } }
+  void Run() { ready.unlock(); }
+  void Kill() { done = 1; Run(); join(); }
+};
+
+class Lock : public Mutex {};
+
+static inline void yield() { pthread_yield(); }
+
+#endif