134 lines
4.7 KiB
C++
134 lines
4.7 KiB
C++
#ifndef CTHREAD_H
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#define CTHREAD_H
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class IJob;
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class CThreadRep;
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// note -- do not derive from this class
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class CThread {
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public:
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// create and start a new thread executing the job.
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// the user data can be retrieved with getUserData().
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CThread(IJob* adopted, void* userData = 0);
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// make a new thread object that refers to an existing thread.
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// this does *not* start a new thread.
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CThread(const CThread&);
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// release thread. this does not terminate the thread. a thread
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// will keep running until the job completes or calls exit().
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~CThread();
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// manipulators
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// assign thread. this has no effect on the threads. it simply
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// makes this thread object refer to another thread. it does *not*
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// start a new thread.
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CThread& operator=(const CThread&);
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// initialize the thread library. this must be called before
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// any other thread methods or creating a thread object. it
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// is harmless to call init() multiple times.
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static void init();
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// the calling thread sleeps for the given number of seconds. if
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// timeout <= 0.0 then the call returns immediately. if timeout
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// == 0.0 then the calling thread yields the CPU.
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// (cancellation point)
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static void sleep(double timeout);
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// terminate the calling thread. this function does not return but
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// the stack is unwound and automatic objects are destroyed, as if
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// exit() threw an exception (which is, in fact, what it does). the
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// argument is saved as the result returned by getResult(). if you
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// have a catch(...) block then you should add the following before
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// it to avoid catching the exit: catch(CThreadExit&) { throw; }
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static void exit(void*);
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// enable/disable cancellation. default is enabled. this is not
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// a cancellation point so if you enabled cancellation and want to
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// allow immediate cancellation you need to call testCancel().
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// return value is the previous state.
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static bool enableCancel(bool);
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// cancel the thread. cancel() never waits for the thread to
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// terminate; it just posts the cancel and returns. a thread will
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// terminate when it enters a cancellation point with cancellation
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// enabled. if cancellation is disabled then the cancel is
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// remembered but not acted on until the first call to a
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// cancellation point after cancellation is enabled.
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//
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// a cancellation point is a function that can act on cancellation.
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// a cancellation point does not return if there's a cancel pending.
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// instead, it unwinds the stack and destroys automatic objects, as
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// if cancel() threw an exception (which is, in fact, what it does).
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// threads must take care to clean up and release any resources they
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// may have, especially mutexes. they can catch (XThreadCancel) to
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// do that then rethrow the exception or they can let it happen
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// automatically by doing clean up in the d'tors of automatic
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// objects. clients are strongly encouraged to do the latter.
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// during cancellation, further cancel() calls are ignored (i.e.
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// a thread cannot be interrupted by a cancel during cancellation).
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//
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// clients that catch (XThreadCancel) must always rethrow the
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// exception. clients that catch(...) must either rethrow the
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// exception or include a catch (XThreadCancel) handler that
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// rethrows.
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void cancel();
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// change the priority of the thread. normal priority is 0, 1 is
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// the next lower, etc. -1 is the next higher, etc. but boosting
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// the priority may not be available.
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void setPriority(int n);
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// accessors
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// return a thread object representing the calling thread
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static CThread getCurrentThread();
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// get the user data passed to the constructor for the current
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// thread.
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static void* getUserData();
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// testCancel() does nothing but is a cancellation point. call
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// this to make a function itself a cancellation point.
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// (cancellation point)
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static void testCancel();
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// waits for the thread to terminate (by exit() or cancel() or
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// by returning from the thread job). returns immediately if
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// the thread has already terminated. returns immediately with
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// false if called by a thread on itself. returns false on
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// timeout (or error) and true on success.
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// (cancellation point)
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bool wait(double timeout = -1.0) const;
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// get the exit result. does an implicit wait(). returns NULL
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// immediately if called by a thread on itself. returns NULL for
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// threads that were cancelled.
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// (cancellation point)
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void* getResult() const;
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// compare threads for (in)equality
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bool operator==(const CThread&) const;
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bool operator!=(const CThread&) const;
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private:
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CThread(CThreadRep*);
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private:
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CThreadRep* m_rep;
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};
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// disables cancellation in the c'tor and enables it in the d'tor.
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class CThreadMaskCancel {
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public:
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CThreadMaskCancel();
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~CThreadMaskCancel();
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private:
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bool m_old;
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};
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#endif
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