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oslib-posix: take lock before qemu_cond_broadcast 

In touch_all_pages, if the mutex is not taken around qemu_cond_broadcast,
qemu_cond_broadcast may be called before all touch page threads enter
qemu_cond_wait. In this case, the touch page threads wait forever for the
main thread to wake them up, causing a deadlock.

Signed-off-by: Bauerchen <bauerchen@tencent.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Bauerchen 2020-04-06 10:36:54 +08:00 committed by Paolo Bonzini
parent 9a709f06c8
commit 278fb16273
1 changed files with 3 additions and 0 deletions
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util/oslib-posix.c
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@ -492,8 +492,11 @@ static bool touch_all_pages(char *area, size_t hpagesize, size_t numpages,
QEMU_THREAD_JOINABLE);
addr += memset_thread[i].numpages * hpagesize;
}
qemu_mutex_lock(&page_mutex);
threads_created_flag = true;
qemu_cond_broadcast(&page_cond);
qemu_mutex_unlock(&page_mutex);
for (i = 0; i < memset_num_threads; i++) {
qemu_thread_join(&memset_thread[i].pgthread);