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system/main: comment lock rationale

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Signed-off-by: Pierrick Bouvier <pierrick.bouvier@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-ID: <20250515174641.4000309-1-pierrick.bouvier@linaro.org>
This commit is contained in:
Pierrick Bouvier 2025-05-15 10:46:41 -07:00 committed by Richard Henderson
parent 319b0c8d07
commit 556d05d1e2
1 changed files with 13 additions and 0 deletions
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13
system/main.c
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@ -69,8 +69,21 @@ int (*qemu_main)(void) = os_darwin_cfrunloop_main;
int main(int argc, char **argv) int main(int argc, char **argv)
{ {
qemu_init(argc, argv); qemu_init(argc, argv);
/*
* qemu_init acquires the BQL and replay mutex lock. BQL is acquired when
* initializing cpus, to block associated threads until initialization is
* complete. Replay_mutex lock is acquired on initialization, because it
* must be held when configuring icount_mode.
*
* On MacOS, qemu main event loop runs in a background thread, as main
* thread must be reserved for UI. Thus, we need to transfer lock ownership,
* and the simplest way to do that is to release them, and reacquire them
* from qemu_default_main.
*/
bql_unlock(); bql_unlock();
replay_mutex_unlock(); replay_mutex_unlock();
if (qemu_main) { if (qemu_main) {
QemuThread main_loop_thread; QemuThread main_loop_thread;
qemu_thread_create(&main_loop_thread, "qemu_main", qemu_thread_create(&main_loop_thread, "qemu_main",