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Block thread from receiving profile signal with stackwalk lock #57089

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merged 1 commit into from
Jan 18, 2025
+6 −15
Merged

Block thread from receiving profile signal with stackwalk lock #57089

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21 changes: 6 additions & 15 deletions src/signals-unix.c
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Original file line number Diff line number Diff line change
Expand Up @@ -310,23 +310,14 @@ int exc_reg_is_write_fault(uintptr_t esr) {
#include <sys/eventfd.h>
#include <link.h>

typedef struct {
void (*f)(void*) JL_NOTSAFEPOINT;
void *ctx;
} callback_t;
static int with_dl_iterate_phdr_lock(struct dl_phdr_info *info, size_t size, void *data)
{
jl_lock_profile();
callback_t *callback = (callback_t*)data;
callback->f(callback->ctx);
jl_unlock_profile();
return 1; // only call this once
}

void jl_with_stackwalk_lock(void (*f)(void*), void *ctx)
{
callback_t callback = {f, ctx};
dl_iterate_phdr(with_dl_iterate_phdr_lock, &callback);
sigset_t sset, oset;
sigemptyset(&sset);
sigaddset(&sset, SIGUSR2);
pthread_sigmask(SIG_BLOCK, &sset, &oset);
f(ctx);
pthread_sigmask(SIG_SETMASK, &oset, NULL);
}

#if defined(_OS_LINUX_) && (defined(_CPU_X86_64_) || defined(_CPU_X86_))
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