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tcg: synchronize exit_request and tcg_current_cpu accesses

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Synchronize the remaining pair of accesses in cpu_signal. These should
be necessary on Windows as well, at least in theory. Probably
SuspendProcess and ResumeProcess introduce some implicit memory
barrier.

Backports relevant parts of commit aed807c8e2bf009b2c6a35490d4fd4383887221d from qemu
This commit is contained in:
Paolo Bonzini 2018-02-15 13:13:06 -05:00 committed by Lioncash
parent 7f1d59bb83
commit 62045513bb
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GPG key ID: 4E3C3CC1031BA9C7
1 changed files with 1 additions and 1 deletions
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qemu/cpu-exec.c
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@ -90,7 +90,7 @@ int cpu_exec(struct uc_struct *uc, CPUState *cpu)
uc->current_cpu = cpu;
atomic_mb_set(&uc->tcg_current_cpu, cpu);
if (unlikely(uc->exit_request)) {
if (unlikely(atomic_mb_read(&uc->exit_request))) {
cpu->exit_request = 1;
}