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Use semaphores to suspend the redraw thread while switching video mode.

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This commit is contained in:
gbeauche 2007-07-21 11:41:07 +00:00
parent efa32be9ec
commit 1cf3b07fe6
1 changed files with 18 additions and 8 deletions
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26
SheepShaver/src/Unix/video_x.cpp
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@ -37,6 +37,7 @@
#include <sys/shm.h>
#include <errno.h>
#include <pthread.h>
#include <semaphore.h>
#include <algorithm>
@ -87,10 +88,11 @@ static pthread_attr_t redraw_thread_attr; // Redraw thread attributes
static volatile bool redraw_thread_cancel; // Flag: Cancel Redraw thread
static pthread_t redraw_thread; // Redraw thread
static bool local_X11; // Flag: X server running on local machine?
static volatile bool thread_stop_req = false;
static volatile bool thread_stop_ack = false; // Acknowledge for thread_stop_req
static sem_t thread_stop_ack;
static sem_t thread_resume_req;
static bool local_X11; // Flag: X server running on local machine?
static bool has_dga = false; // Flag: Video DGA capable
static bool has_vidmode = false; // Flag: VidMode extension available
@ -1661,6 +1663,10 @@ bool VideoInit(void)
// Start periodic thread
XSync(x_display, false);
if (sem_init(&thread_stop_ack, 0, 0) < 0)
return false;
if (sem_init(&thread_resume_req, 0, 0) < 0)
return false;
Set_pthread_attr(&redraw_thread_attr, 0);
redraw_thread_cancel = false;
redraw_thread_active = (pthread_create(&redraw_thread, &redraw_thread_attr, redraw_func, NULL) == 0);
@ -1680,6 +1686,8 @@ void VideoExit(void)
redraw_thread_cancel = true;
pthread_cancel(redraw_thread);
pthread_join(redraw_thread, NULL);
sem_destroy(&thread_stop_ack);
sem_destroy(&thread_resume_req);
redraw_thread_active = false;
}
@ -2157,10 +2165,10 @@ int16 video_mode_change(VidLocals *csSave, uint32 ParamPtr)
csSave->savePage = ReadMacInt16(ParamPtr + csPage);
// Disable interrupts and pause redraw thread
DisableInterrupt();
thread_stop_ack = false;
thread_stop_req = true;
while (!thread_stop_ack) ;
sem_wait(&thread_stop_ack);
thread_stop_req = false;
DisableInterrupt();
/* close old display */
close_display();
@ -2181,8 +2189,8 @@ int16 video_mode_change(VidLocals *csSave, uint32 ParamPtr)
csSave->saveMode=VModes[cur_mode].viAppleMode;
// Enable interrupts and resume redraw thread
thread_stop_req = false;
EnableInterrupt();
sem_post(&thread_resume_req);
return noErr;
}
}
@ -2434,8 +2442,10 @@ static void *redraw_func(void *arg)
while (!redraw_thread_cancel) {
// Pause if requested (during video mode switches)
while (thread_stop_req)
thread_stop_ack = true;
if (thread_stop_req) {
sem_post(&thread_stop_ack);
sem_wait(&thread_resume_req);
}
int64 delay = next - GetTicks_usec();
if (delay < -VIDEO_REFRESH_DELAY) {