mirrors/cosmopolitan
1
0
Fork 0
mirror of https://github.com/jart/cosmopolitan.git synced 2025-07-07 03:38:31 +00:00
Code Issues Projects Releases Packages Wiki Activity Actions

Simplify TLS and reduce startup latency

Browse source 
This change simplifies the thread-local storage support code. On Windows
and Mac OS X the startup latency of __enable_tls() has been reduced from
30ms to 1ms. On Windows, TLS memory accesses will now go much faster due
to better self-modifying code that prevents a function call and acquires
our thread information block pointer in a single instruction.
This commit is contained in:
Justine Tunney 2022-07-18 03:33:32 -07:00
parent 38c3fa63fe
commit b1d9d11be1
15 changed files with 136 additions and 312 deletions
Download patch file Download diff file Expand all files Collapse all files

4
libc/intrin/gettid.greg.c
View file

@ -50,10 +50,10 @@
* @asyncsignalsafe
* @threadsafe
*/
privileged int gettid(void) {
int gettid(void) {
int tid;
if (__tls_enabled) {
tid = *(int *)(__get_tls_inline() + 0x38);
tid = *(int *)(__get_tls() + 0x38);
if (tid > 0) return tid;
}
return sys_gettid();