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event_trigger_unix.cpp

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#include "Core/precomp.h"
#include "event_trigger_unix.h"

#include <sys/time.h>
#include <sys/types.h>
#include <unistd.h>

// CL_EventTrigger_Unix construction:

CL_EventTrigger_Unix::CL_EventTrigger_Unix()
{
        pipe(wait_pipe);
}

CL_EventTrigger_Unix::~CL_EventTrigger_Unix()
{
        close(wait_pipe[0]);
        close(wait_pipe[1]);
}

// CL_EventTrigger_Unix attributes:

bool CL_EventTrigger_Unix::get_flag() const
{
        return wait(0);
}

// CL_EventTrigger_Unix operations:

void CL_EventTrigger_Unix::reset() const
{
        char v = 0;
        while (wait(0)) read(wait_pipe[0], &v, 1);
}

void CL_EventTrigger_Unix::set_flag()
{
        char v = 1;
        if (!wait(0)) write(wait_pipe[1], &v, 1);
}

bool CL_EventTrigger_Unix::wait(int timeout) const
{
        fd_set rfds;
        FD_ZERO(&rfds);
        FD_SET(wait_pipe[0], &rfds);

        timeval tv;
        tv.tv_sec = 0;
        tv.tv_usec = timeout;

        int result = select(wait_pipe[0]+1, &rfds, NULL, NULL, (timeout == 1) ? NULL : &tv);
        if (result <= 0) return false;

        return true;
}

// CL_EventTrigger_Unix implementation:

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