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Tidy up the threading implementation

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The organization of the source files is now much more rational.
Old experiments that didn't work out are now deleted. Naming of
things like files is now more intuitive.
This commit is contained in:
Justine Tunney 2022-09-10 02:56:25 -07:00
parent e9272f03fb
commit 155b378a39
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GPG key ID: BE714B4575D6E328
199 changed files with 526 additions and 685 deletions
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21
libc/intrin/gettid.c
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@ -21,8 +21,7 @@
#include "libc/calls/state.internal.h"
#include "libc/calls/syscall-sysv.internal.h"
#include "libc/dce.h"
#include "libc/nexgen32e/gettls.h"
#include "libc/nexgen32e/threaded.h"
#include "libc/thread/tls.h"
/**
* Returns current thread id.
@ -31,22 +30,6 @@
* 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
@ -55,7 +38,7 @@
int gettid(void) {
int tid;
if (__tls_enabled && !__vforked) {
tid = *(int *)(__get_tls() + 0x38);
tid = __get_tls()->tib_tid;
if (tid > 0) {
return tid;
}