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winealsa: Use a pipe to signal the end of the record thread. 

This means the thread doesn't have to wake every 250ms to test
"end_thread".

Signed-off-by: Huw Davies <huw@codeweavers.com>
Signed-off-by: Andrew Eikum <aeikum@codeweavers.com>
Signed-off-by: Alexandre Julliard <julliard@winehq.org>
This commit is contained in:
Huw Davies 2022-03-25 08:42:16 +00:00 committed by Alexandre Julliard
parent 048a8c3346
commit 32746a292d
1 changed files with 18 additions and 7 deletions
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25
dlls/winealsa.drv/midi.c
View File

@ -54,7 +54,7 @@ static int MIDM_NumDevs = 0;
static int numStartedMidiIn = 0;
static int end_thread;
static int rec_cancel_pipe[2];
static HANDLE hThread;
static void seq_lock(void)
@ -162,18 +162,25 @@ static DWORD WINAPI midRecThread(void *arg)
struct pollfd *pollfd;
int ret;
num_fds = snd_seq_poll_descriptors_count(midi_seq, POLLIN);
/* Add on one for the read end of the cancel pipe */
num_fds = snd_seq_poll_descriptors_count(midi_seq, POLLIN) + 1;
pollfd = malloc(num_fds * sizeof(struct pollfd));
while(!end_thread) {
while(1) {
pollfd[0].fd = rec_cancel_pipe[0];
pollfd[0].events = POLLIN;
seq_lock();
snd_seq_poll_descriptors(midi_seq, pollfd, num_fds, POLLIN);
snd_seq_poll_descriptors(midi_seq, pollfd + 1, num_fds - 1, POLLIN);
seq_unlock();
/* Check if an event is present */
if (poll(pollfd, num_fds, 250) <= 0)
if (poll(pollfd, num_fds, -1) <= 0)
continue;
if (pollfd[0].revents & POLLIN) /* cancelled */
break;
do {
snd_seq_event_t *ev;
@ -259,9 +266,11 @@ static DWORD midOpen(WORD wDevID, LPMIDIOPENDESC lpDesc, DWORD dwFlags)
TRACE("Input port :%d connected %d:%d\n",port_in,MidiInDev[wDevID].addr.client,MidiInDev[wDevID].addr.port);
if (numStartedMidiIn++ == 0) {
end_thread = 0;
pipe(rec_cancel_pipe);
hThread = CreateThread(NULL, 0, midRecThread, midi_seq, 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();
@ -302,11 +311,13 @@ 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");
}