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AK: Use getrlimit() to find the correct main thread stack size on macOS

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This is what JavaScriptCore does as well.
This commit is contained in:
Andreas Kling 2024-11-10 13:24:21 +01:00 committed by Andreas Kling
parent 1510c1876c
commit 11458f0d91
Notes: github-actions[bot] 2024-11-10 18:14:09 +00:00 
Author: https://github.com/awesomekling
Commit: https://github.com/LadybirdBrowser/ladybird/commit/11458f0d916
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/2268
1 changed files with 10 additions and 5 deletions
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15
AK/StackInfo.cpp
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@ -65,11 +65,16 @@ StackInfo::StackInfo()
// MacOS seems inconsistent on what stack size is given for the main thread. // MacOS seems inconsistent on what stack size is given for the main thread.
// According to the Apple docs, default for main thread is 8MB, and default for // According to the Apple docs, default for main thread is 8MB, and default for
// other threads is 512KB // other threads is 512KB
constexpr size_t eight_megabytes = 0x800000; if (pthread_main_np() == 1) {
if (pthread_main_np() == 1 && m_size < eight_megabytes) { // Apparently the main thread's stack size is not reported correctly on macOS
// Assume no one messed with stack size linker options for the main thread, // but we can use getrlimit to get the correct value.
// and just set it to 8MB. rlimit limit {};
m_size = eight_megabytes; getrlimit(RLIMIT_STACK, &limit);
if (limit.rlim_cur == RLIM_INFINITY) {
m_size = 8 * MiB;
} else {
m_size = limit.rlim_cur;
}
} }
m_base = top_of_stack - m_size; m_base = top_of_stack - m_size;
#elif defined(AK_OS_OPENBSD) #elif defined(AK_OS_OPENBSD)