diff options
| author | Bauerchen <bauerchen@tencent.com> | 2020-04-06 10:36:54 +0800 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2020-04-11 08:49:20 -0400 |
| commit | 278fb1627351218b23dd33403f08d7521643fda2 (patch) | |
| tree | 4ef80980b91fe3b59b4a3ff523f18fb1546f7249 /util/oslib-posix.c | |
| parent | 9a709f06c87043856307ce824b2ba47e0fdb7621 (diff) | |
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>
Diffstat (limited to 'util/oslib-posix.c')
| -rw-r--r-- | util/oslib-posix.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/util/oslib-posix.c b/util/oslib-posix.c index 4dd6d7d4b4..062236a1ab 100644 --- a/util/oslib-posix.c +++ b/util/oslib-posix.c @@ -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); |