mirror of https://github.com/VDR4Arch/vdr.git
124 lines
2.8 KiB
C++
124 lines
2.8 KiB
C++
/*
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* thread.h: A simple thread base class
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*
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* See the main source file 'vdr.c' for copyright information and
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* how to reach the author.
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*
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* $Id: thread.h 1.15 2003/05/03 14:03:36 kls Exp $
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*/
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#ifndef __THREAD_H
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#define __THREAD_H
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#include <pthread.h>
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#include <stdio.h>
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#include <sys/types.h>
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class cMutex;
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class cCondVar {
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private:
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pthread_cond_t cond;
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public:
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cCondVar(void);
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~cCondVar();
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void Wait(cMutex &Mutex);
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bool TimedWait(cMutex &Mutex, int TimeoutMs);
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void Broadcast(void);
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//void Signal(void);
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};
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class cMutex {
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friend class cCondVar;
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private:
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pthread_mutex_t mutex;
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pid_t lockingPid;
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int locked;
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public:
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cMutex(void);
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~cMutex();
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void Lock(void);
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void Unlock(void);
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};
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class cThread {
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friend class cThreadLock;
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private:
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pthread_t thread;
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cMutex mutex;
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pid_t parentPid, threadPid;
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bool running;
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static bool emergencyExitRequested;
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static bool signalHandlerInstalled;
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static void SignalHandler(int signum);
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static void *StartThread(cThread *Thread);
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protected:
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void Lock(void) { mutex.Lock(); }
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void Unlock(void) { mutex.Unlock(); }
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void WakeUp(void);
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virtual void Action(void) = 0;
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void Cancel(int WaitSeconds = 0);
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public:
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cThread(void);
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virtual ~cThread();
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bool Start(void);
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bool Active(void);
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static bool EmergencyExit(bool Request = false);
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};
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// cMutexLock can be used to easily set a lock on mutex and make absolutely
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// sure that it will be unlocked when the block will be left. Several locks can
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// be stacked, so a function that makes many calls to another function which uses
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// cMutexLock may itself use a cMutexLock to make one longer lock instead of many
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// short ones.
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class cMutexLock {
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private:
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cMutex *mutex;
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bool locked;
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public:
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cMutexLock(cMutex *Mutex = NULL);
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~cMutexLock();
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bool Lock(cMutex *Mutex);
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};
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// cThreadLock can be used to easily set a lock in a thread and make absolutely
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// sure that it will be unlocked when the block will be left. Several locks can
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// be stacked, so a function that makes many calls to another function which uses
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// cThreadLock may itself use a cThreadLock to make one longer lock instead of many
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// short ones.
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class cThreadLock {
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private:
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cThread *thread;
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bool locked;
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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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};
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#define LOCK_THREAD cThreadLock ThreadLock(this)
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// cPipe implements a pipe that closes all unnecessary file descriptors in
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// the child process.
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class cPipe {
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private:
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pid_t pid;
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FILE *f;
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public:
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cPipe(void);
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~cPipe();
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operator FILE* () { return f; }
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bool Open(const char *Command, const char *Mode);
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int Close(void);
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};
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// SystemExec() implements a 'system()' call that closes all unnecessary file
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// descriptors in the child process.
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int SystemExec(const char *Command);
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#endif //__THREAD_H
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