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Make more threading improvements

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- ASAN memory morgue is now lockless
- Make C11 atomics header more portable
- Rewrote pthread keys support to be lockless
- Simplify Python's unicode table unpacking code
- Make crash report write(2) closer to being atomic
- Make it possible to strace/ftrace a single thread
- ASAN now checks nul-terminated strings fast and properly
- Windows fork() now restores TLS memory of calling thread
This commit is contained in:
Justine Tunney 2022-11-01 22:36:03 -07:00
parent d7b88734cd
commit e522aa3a07
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GPG key ID: BE714B4575D6E328
189 changed files with 1363 additions and 1217 deletions
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18
libc/thread/mktls.c
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@ -38,7 +38,8 @@ void Bzero(void *, size_t) asm("bzero"); // gcc bug
*/
char *_mktls(struct CosmoTib **out_tib) {
char *tls;
struct CosmoTib *tib;
struct CosmoTib *neu, *old;
__require_tls();
// allocate memory for tdata, tbss, and tib
tls = memalign(TLS_ALIGNMENT, I(_tls_size) + sizeof(struct CosmoTib));
@ -55,14 +56,17 @@ char *_mktls(struct CosmoTib **out_tib) {
Bzero(tls + I(_tbss_offset), I(_tbss_size) + sizeof(struct CosmoTib));
// set up thread information block
tib = (struct CosmoTib *)(tls + I(_tls_size));
tib->tib_self = tib;
tib->tib_self2 = tib;
tib->tib_sigmask = __get_tls()->tib_sigmask;
atomic_store_explicit(&tib->tib_tid, -1, memory_order_relaxed);
old = __get_tls();
neu = (struct CosmoTib *)(tls + I(_tls_size));
neu->tib_self = neu;
neu->tib_self2 = neu;
neu->tib_ftrace = old->tib_ftrace;
neu->tib_strace = old->tib_strace;
neu->tib_sigmask = old->tib_sigmask;
atomic_store_explicit(&neu->tib_tid, -1, memory_order_relaxed);
if (out_tib) {
*out_tib = tib;
*out_tib = neu;
}
return tls;
}