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Check effective suspension of TCG thread

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On multi-core systems, SuspendThread does not guaranty immediate thread
suspension. We add busy loop to wait for effective thread suspension
after call to ThreadSuspend().

Signed-off-by: Fabien Chouteau <chouteau@adacore.com>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Stefan Weil <sw@weilnetz.de>
This commit is contained in:
Olivier Hainque 2013-04-09 18:06:53 +02:00 committed by Stefan Weil
parent 93b48c201e
commit ed9164a354
1 changed files with 22 additions and 2 deletions
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24
cpus.c
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@ -862,9 +862,29 @@ static void qemu_cpu_kick_thread(CPUState *cpu)
}
#else /* _WIN32 */
if (!qemu_cpu_is_self(cpu)) {
SuspendThread(cpu->hThread);
CONTEXT tcgContext;
if (SuspendThread(cpu->hThread) == (DWORD)-1) {
fprintf(stderr, "qemu:%s: GetLastError:%d\n", __func__,
GetLastError());
exit(1);
}
/* On multi-core systems, we are not sure that the thread is actually
* suspended until we can get the context.
*/
tcgContext.ContextFlags = CONTEXT_CONTROL;
while (GetThreadContext(cpu->hThread, &tcgContext) != 0) {
continue;
}
cpu_signal(0);
ResumeThread(cpu->hThread);
if (ResumeThread(cpu->hThread) == (DWORD)-1) {
fprintf(stderr, "qemu:%s: GetLastError:%d\n", __func__,
GetLastError());
exit(1);
}
}
#endif
}