Abseil Common Libraries (C++) (grcp 依赖) https://abseil.io/

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abseil-cpp/absl

History

Abseil Team b3e64c4168 Mutex: Fix stall on single-core systems ... On single-core systems, a thread could be preempted while holding an absl::Mutex, or even worse, the spin lock. If a FIFO thread wakes up and tries to acquire this lock, it might not be able to yield() to the sleeping thread. Within MutexDelay(), a yield() and a sleep(10us) are used to yield the CPU. The yield() would do nothing if the calling thread holds the highest priority in the system. The 10us sleep() may not be able to reach the scheduler either, if the system is slow enough. This code path is known to be reachable in the following scenarios: - a FIFO thread calls LockSlowLoop() with spin lock held by a normal thread - a FIFO thread calls LockWhen*() with the Mutex held by a normal thread for a long time - a FIFO thread calls Await*(), releases the Mutex to be held by a normal thread for a long time This CL adds a mutex global for the sleep time, and sets it using the return time of the a yield() call. Yield() must reach the scheduler even when it fails to yield to anyone, and would allow sleep() to do the same. A small constant multiplier (5) is also applied to overcome uncontrollable factors in the runtime and help sleep() to consistently yield to another thread. Upper and lower bounds for the sleep time is also controlled to block any unreasonable values. PiperOrigin-RevId: 483459711 Change-Id: I14efadbadaf9244a2462f377b515147bda651c89		2 years ago
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algorithm	…
base	…
cleanup	…
container	Use btree iterator subtraction instead of std::distance in erase_range() and count().	2 years ago
copts	…
debugging	…
flags	…
functional	…
hash	…
log	Fix a truncation warning on Windows 64-bit.	2 years ago
memory	Fix sign conversion warnings in memory_test.cc.	2 years ago
meta	…
numeric	…
profiling	…
random	…
status	…
strings	Document Base64Unescape() padding	2 years ago
synchronization	Mutex: Fix stall on single-core systems	2 years ago
time	Eliminate use of internal interfaces and make the test portable and expose it to OSS.	2 years ago
types	…
utility	…
BUILD.bazel	…
CMakeLists.txt	…
abseil.podspec.gen.py	…