5b55ba8053
Apparently on macOS `setjmp` manipulates the process-wide signal mask which adds a good deal of overhead. We don't actually need this functionality so this commit switches to using the `sig` version of setjmp/longjmp where we can explicitly ask the signal mask to not get preserved. This came out of poking around on #2644 and on macOS locally thi sdropped the overhead from 721ns to 55ns.
34 lines
954 B
C
34 lines
954 B
C
#include <setjmp.h>
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// Note that `sigsetjmp` and `siglongjmp` are used here where possible to
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// explicitly pass a 0 argument to `sigsetjmp` that we don't need to preserve
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// the process signal mask. This should make this call a bit faster b/c it
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// doesn't need to touch the kernel signal handling routines.
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#ifdef CFG_TARGET_OS_windows
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#define platform_setjmp(buf) setjmp(buf)
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#define platform_longjmp(buf, arg) longjmp(buf, arg)
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#define platform_jmp_buf jmp_buf
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#else
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#define platform_setjmp(buf) sigsetjmp(buf, 0)
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#define platform_longjmp(buf, arg) siglongjmp(buf, arg)
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#define platform_jmp_buf sigjmp_buf
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#endif
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int RegisterSetjmp(
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void **buf_storage,
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void (*body)(void*),
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void *payload) {
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platform_jmp_buf buf;
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if (platform_setjmp(buf) != 0) {
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return 0;
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}
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*buf_storage = &buf;
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body(payload);
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return 1;
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}
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void Unwind(void *JmpBuf) {
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platform_jmp_buf *buf = (platform_jmp_buf*) JmpBuf;
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platform_longjmp(*buf, 1);
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}
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