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c/multi: Document flattened out producer/consumer construct

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This commit is contained in:
Jakob Bornecrantz 2022-05-25 20:25:25 +01:00
parent 2afdb79895
commit f404cc4c50
1 changed files with 11 additions and 1 deletions
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12
src/xrt/compositor/multi/comp_multi_compositor.c
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@ -227,8 +227,18 @@ run_func(void *ptr)
mc->wait_thread.alive = true;
os_thread_helper_signal_locked(&mc->wait_thread.oth);
/*
* One can view the layer_commit function and the wait thread as a
* producer/consumer pair. This loop is the consumer side of that pair.
* We look for either a fence or a semaphore on each loop, if none are
* found we check if we are running then wait on the conditional
* variable once again waiting to be signalled by the producer.
*/
while (os_thread_helper_is_running_locked(&mc->wait_thread.oth)) {
/*
* Here we wait for the either a semaphore or a fence, if
* neither has been set we wait/sleep here (again).
*/
if (mc->wait_thread.xcsem == NULL && mc->wait_thread.xcf == NULL) {
// Spurious wakeups are handled below.
os_thread_helper_wait_locked(&mc->wait_thread.oth);