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/*
* thread.h: A simple thread base class
*
* See the main source file 'vdr.c' for copyright information and
* how to reach the author.
*
* $Id: thread.h 1.10 2001/10/20 10:25:19 kls Exp $
*/
#ifndef __THREAD_H
#define __THREAD_H
#include <pthread.h>
#include <stdio.h>
#include <sys/types.h>
class cMutex;
class cCondVar {
private:
pthread_cond_t cond;
public:
cCondVar(void);
~cCondVar();
bool Wait(cMutex &Mutex);
//bool TimedWait(cMutex &Mutex, unsigned long tmout);
void Broadcast(void);
//void Signal(void);
};
class cMutex {
friend class cCondVar;
private:
pthread_mutex_t mutex;
pid_t lockingPid;
int locked;
public:
cMutex(void);
~cMutex();
void Lock(void);
void Unlock(void);
};
class cThread {
friend class cThreadLock;
private:
pthread_t thread;
cMutex Mutex;
pid_t parentPid, threadPid, lockingPid;
int locked;
bool running;
static time_t lastPanic;
static int panicLevel;
static bool emergencyExitRequested;
static bool signalHandlerInstalled;
static void SignalHandler(int signum);
static void *StartThread(cThread *Thread);
bool Lock(void);
void Unlock(void);
protected:
void WakeUp(void);
virtual void Action(void) = 0;
void Cancel(int WaitSeconds = 0);
public:
cThread(void);
virtual ~cThread();
bool Start(void);
bool Active(void);
static void RaisePanic(void);
static bool EmergencyExit(bool Request = false);
};
// cThreadLock can be used to easily set a lock in a thread and make absolutely
// sure that it will be unlocked when the block will be left. Several locks can
// be stacked, so a function that makes many calls to another function which uses
// cThreadLock may itself use a cThreadLock to make one longer lock instead of many
// short ones.
class cThreadLock {
private:
cThread *thread;
bool locked;
public:
cThreadLock(cThread *Thread = NULL);
~cThreadLock();
bool Lock(cThread *Thread);
bool Locked(void);
};
#define LOCK_THREAD cThreadLock ThreadLock(this)
// cPipe implements a pipe that closes all unnecessary file descriptors in
// the child process.
class cPipe {
private:
pid_t pid;
FILE *f;
public:
cPipe(void);
~cPipe();
operator FILE* () { return f; }
bool Open(const char *Command, const char *Mode);
int Close(void);
};
// SystemExec() implements a 'system()' call that closes all unnecessary file
// descriptors in the child process.
int SystemExec(const char *Command);
#endif //__THREAD_H
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