[PATCH 4/6] wineoss: Use a pipe to signal the end of the record thread.

[Andrew Eikum]

Signed-off-by: Andrew Eikum <aeikum at codeweavers.com>

On Fri, Apr 29, 2022 at 08:29:56AM +0100, Huw Davies wrote:
> Signed-off-by: Huw Davies <huw at codeweavers.com>
> ---
>  dlls/wineoss.drv/midi.c | 42 ++++++++++++++++++++---------------------
>  1 file changed, 21 insertions(+), 21 deletions(-)
> 
> diff --git a/dlls/wineoss.drv/midi.c b/dlls/wineoss.drv/midi.c
> index 0afd9985c03..c83dd55fd6b 100644
> --- a/dlls/wineoss.drv/midi.c
> +++ b/dlls/wineoss.drv/midi.c
> @@ -70,7 +70,7 @@ static	int 		MIDM_NumDevs = 0;
>  
>  static	int		numStartedMidiIn = 0;
>  
> -static int end_thread;
> +static int rec_cancel_pipe[2];
>  static HANDLE hThread;
>  
>  /*======================================================================*
> @@ -214,30 +214,26 @@ static DWORD WINAPI midRecThread(void *arg)
>      int fd = (int)(INT_PTR)arg;
>      unsigned char buffer[256];
>      int len;
> -    struct pollfd pfd;
> +    struct pollfd pollfd[2];
>  
> -    TRACE("Thread startup\n");
> -
> -    pfd.fd = fd;
> -    pfd.events = POLLIN;
> -    
> -    while(!end_thread) {
> -	TRACE("Thread loop\n");
> +    pollfd[0].fd = rec_cancel_pipe[0];
> +    pollfd[0].events = POLLIN;
> +    pollfd[1].fd = fd;
> +    pollfd[1].events = POLLIN;
>  
> +    while (1)
> +    {
>  	/* Check if an event is present */
> -	if (poll(&pfd, 1, 250) <= 0)
> +	if (poll(pollfd, ARRAY_SIZE(pollfd), -1) <= 0)
>  	    continue;
> -	
> -	len = read(fd, buffer, sizeof(buffer));
> -	TRACE("Received %d bytes\n", len);
>  
> -	if (len < 0) continue;
> -	if ((len % 4) != 0) {
> -	    WARN("Bad length %d, errno %d (%s)\n", len, errno, strerror(errno));
> -	    continue;
> -	}
> +	if (pollfd[0].revents & POLLIN) /* cancelled */
> +	    break;
> +
> +	len = read(fd, buffer, sizeof(buffer));
>  
> -	handle_midi_data(buffer, len);
> +	if (len > 0 && len % 4 == 0)
> +	    handle_midi_data(buffer, len);
>      }
>      return 0;
>  }
> @@ -286,9 +282,11 @@ static DWORD midOpen(WORD wDevID, LPMIDIOPENDESC lpDesc, DWORD dwFlags)
>      }
>  
>      if (numStartedMidiIn++ == 0) {
> -	end_thread = 0;
> +	pipe(rec_cancel_pipe);
>  	hThread = CreateThread(NULL, 0, midRecThread, (void *)(INT_PTR)fd, 0, NULL);
>  	if (!hThread) {
> +	    close(rec_cancel_pipe[0]);
> +	    close(rec_cancel_pipe[1]);
>  	    numStartedMidiIn = 0;
>  	    WARN("Couldn't create thread for midi-in\n");
>  	    midiCloseSeq(fd);
> @@ -338,11 +336,13 @@ static DWORD midClose(WORD wDevID)
>      }
>      if (--numStartedMidiIn == 0) {
>  	TRACE("Stopping thread for midi-in\n");
> -	end_thread = 1;
> +	write(rec_cancel_pipe[1], "x", 1);
>  	if (WaitForSingleObject(hThread, 5000) != WAIT_OBJECT_0) {
>  	    WARN("Thread end not signaled, force termination\n");
>  	    TerminateThread(hThread, 0);
>  	}
> +	close(rec_cancel_pipe[0]);
> +	close(rec_cancel_pipe[1]);
>      	TRACE("Stopped thread for midi-in\n");
>      }
>      midiCloseSeq(MidiInDev[wDevID].fd);
> -- 
> 2.25.1
> 
>