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Fix some issues and do some code cleanup

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This commit is contained in:
Justine Tunney 2022-05-23 10:15:53 -07:00
parent 1f229e4efc
commit 312ed5c67c
72 changed files with 880 additions and 982 deletions
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21
libc/intrin/gettid.greg.c
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@ -32,8 +32,25 @@ __msabi extern typeof(GetCurrentThreadId) *const __imp_GetCurrentThreadId;
* if this is the main thread. On NetBSD, gettid() for the main thread
* is always 1.
*
* This function issues a system call. That stops being the case as soon
* as __install_tls() is called. That'll happen automatically, when you
* call clone() and provide the TLS parameter. We assume that when a TLS
* block exists, then
*
* *(int *)(__get_tls() + 0x38)
*
* will contain the thread id. Therefore when issuing clone() calls, the
* `CLONE_CHILD_SETTID` and `CLONE_CHILD_CLEARTID` flags should use that
* index as its `ctid` memory.
*
* gettid (single threaded) l: 126𝑐 41𝑛𝑠
* gettid (tls enabled) l: 2𝑐 1𝑛𝑠
*
* The TLS convention is important for reentrant lock performance.
*
* @return thread id greater than zero or -1 w/ errno
* @asyncsignalsafe
* @threadsafe
*/
privileged int gettid(void) {
int rc;
@ -42,9 +59,7 @@ privileged int gettid(void) {
if (__tls_enabled) {
rc = *(int *)(__get_tls() + 0x38);
if (rc && rc != -1) {
return rc;
}
return rc;
}
if (IsWindows()) {