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vdr/thread.h

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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 1.12 2002/02/23 13:53:38 kls Exp $
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*/
#ifndef __THREAD_H
#define __THREAD_H
#include <pthread.h>
#include <stdio.h>
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#include <sys/types.h>
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class cMutex;
class cCondVar {
private:
pthread_cond_t cond;
public:
cCondVar(void);
~cCondVar();
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bool Wait(cMutex &Mutex);
//bool TimedWait(cMutex &Mutex, unsigned long tmout);
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void Broadcast(void);
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//void Signal(void);
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};
class cMutex {
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friend class cCondVar;
private:
pthread_mutex_t mutex;
pid_t lockingPid;
int locked;
public:
cMutex(void);
~cMutex();
void Lock(void);
void Unlock(void);
};
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class cThread {
friend class cThreadLock;
private:
pthread_t thread;
cMutex mutex;
pid_t parentPid, threadPid;
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bool running;
static time_t lastPanic;
static int panicLevel;
static bool emergencyExitRequested;
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static bool signalHandlerInstalled;
static void SignalHandler(int signum);
static void *StartThread(cThread *Thread);
void Lock(void) { mutex.Lock(); }
void Unlock(void) { mutex.Unlock(); }
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protected:
void WakeUp(void);
virtual void Action(void) = 0;
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void Cancel(int WaitSeconds = 0);
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public:
cThread(void);
virtual ~cThread();
bool Start(void);
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bool Active(void);
static void RaisePanic(void);
static bool EmergencyExit(bool Request = false);
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};
// cMutexLock can be used to easily set a lock on mutex 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
// cMutexLock may itself use a cMutexLock to make one longer lock instead of many
// short ones.
class cMutexLock {
private:
cMutex *mutex;
bool locked;
public:
cMutexLock(cMutex *Mutex = NULL);
~cMutexLock();
bool Lock(cMutex *Mutex);
};
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// 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:
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cThreadLock(cThread *Thread = NULL);
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~cThreadLock();
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bool Lock(cThread *Thread);
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};
#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);
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#endif //__THREAD_H