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XQuartz: mieq: Wait for the server to finish initializing before letting other threads mieqEnqueue

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Avoid possible race condition whereby one thread might call mieqEnqueue before InitAndStartDevices finishes
This commit is contained in:
Jeremy Huddleston 2009-01-16 13:54:08 -08:00
parent e917a1cd30
commit 94e417ac87
2 changed files with 34 additions and 5 deletions
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14
dix/main.c
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@ -234,6 +234,12 @@ static int indexForScanlinePad[ 65 ] = {
#endif
#ifdef XQUARTZ
#include <pthread.h>
BOOL serverInitComplete = FALSE;
pthread_mutex_t serverInitCompleteMutex = PTHREAD_MUTEX_INITIALIZER;
pthread_cond_t serverInitCompleteCond = PTHREAD_COND_INITIALIZER;
int dix_main(int argc, char *argv[], char *envp[])
#else
int main(int argc, char *argv[], char *envp[])
@ -378,6 +384,14 @@ int main(int argc, char *argv[], char *envp[])
}
}
#ifdef XQUARTZ
/* Let the other threads know the server is done with its init */
pthread_mutex_lock(&serverInitCompleteMutex);
serverInitComplete = TRUE;
pthread_cond_broadcast(&serverInitCompleteCond);
pthread_mutex_unlock(&serverInitCompleteMutex);
#endif
NotifyParentProcess();
Dispatch();

25
mi/mieq.c
View File

@ -36,11 +36,6 @@ in this Software without prior written authorization from The Open Group.
#include <dix-config.h>
#endif
#ifdef XQUARTZ
#include <pthread.h>
static pthread_mutex_t miEventQueueMutex = PTHREAD_MUTEX_INITIALIZER;
#endif
# define NEED_EVENTS
# include <X11/X.h>
# include <X11/Xmd.h>
@ -87,6 +82,25 @@ typedef struct _EventQueue {
static EventQueueRec miEventQueue;
static EventListPtr masterEvents; /* for use in mieqProcessInputEvents */
#ifdef XQUARTZ
#include <pthread.h>
static pthread_mutex_t miEventQueueMutex = PTHREAD_MUTEX_INITIALIZER;
extern BOOL serverInitComplete;
extern pthread_mutex_t serverInitCompleteMutex;
extern pthread_cond_t serverInitCompleteCond;
static inline void wait_for_server_init(void) {
/* If the server hasn't finished initializing, wait for it... */
if(!serverInitComplete) {
pthread_mutex_lock(&serverInitCompleteMutex);
while(!serverInitComplete)
pthread_cond_wait(&serverInitCompleteCond, &serverInitCompleteMutex);
pthread_mutex_unlock(&serverInitCompleteMutex);
}
}
#endif
Bool
mieqInit(void)
{
@ -145,6 +159,7 @@ mieqEnqueue(DeviceIntPtr pDev, xEvent *e)
int evlen;
#ifdef XQUARTZ
wait_for_server_init();
pthread_mutex_lock(&miEventQueueMutex);
#endif