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MDEV-36684 - main.mdl_sync fails under valgrind (test for Bug#42643)
Valgrind is single threaded and only changes threads as part of system calls or waits. Some busy loops were identified and fixed where the server assumes that some other thread will change the state, which will not happen with valgrind. Based on patch by Monty. Original patch introduced VALGRIND_YIELD, which emits pthread_yield() only in valgrind builds. However it was agreed that it is a good idea to emit yield() unconditionally, such that other affected schedulers (like SCHED_FIFO) benefit from this change. Also avoid pthread_yield() in favour of standard std::this_thread::yield().
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@ -20,6 +20,7 @@
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/* Classes in mysql */
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#include <atomic>
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#include <thread>
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#include "dur_prop.h"
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#include <waiting_threads.h>
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#include "sql_const.h"
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