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replay/replay-internal.c: track holding of replay_lock 

This is modelled after the iothread mutex lock. We keep a TLS flag to
indicate when that thread has acquired the lock and assert we don't
double-lock or release when we shouldn't have.

Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Tested-by: Pavel Dovgalyuk <pavel.dovgaluk@ispras.ru>
Message-Id: <20180227095237.1060.44661.stgit@pasha-VirtualBox>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Alex Bennée 2018-02-27 12:52:37 +03:00 committed by Paolo Bonzini
parent 80be169c1f
commit 180d30bebe
1 changed files with 11 additions and 0 deletions
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11
replay/replay-internal.c
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@ -169,6 +169,8 @@ void replay_finish_event(void)
replay_fetch_data_kind();
}
static __thread bool replay_locked;
void replay_mutex_init(void)
{
qemu_mutex_init(&lock);
@ -179,13 +181,22 @@ void replay_mutex_destroy(void)
qemu_mutex_destroy(&lock);
}
static bool replay_mutex_locked(void)
{
return replay_locked;
}
void replay_mutex_lock(void)
{
g_assert(!replay_mutex_locked());
qemu_mutex_lock(&lock);
replay_locked = true;
}
void replay_mutex_unlock(void)
{
g_assert(replay_mutex_locked());
replay_locked = false;
qemu_mutex_unlock(&lock);
}