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Implement swapcontext() and makecontext()

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This change introduces support for Linux-style uc_context manipulation
that's fast and works well on all supported OSes and architectures. It
also integrates with the Cosmpolitan runtime which can show backtraces
comprised of multiple stacks and fibers. See the test and example code
for further details. This will be used by Mold once it's been vendored
This commit is contained in:
Justine Tunney 2023-07-02 03:50:29 -07:00
parent 7ec84655b4
commit 197aa0d465
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GPG key ID: BE714B4575D6E328
28 changed files with 617 additions and 355 deletions
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6
libc/thread/pthread_attr_setstack.c
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@ -26,13 +26,13 @@
*
* pthread_t id;
* pthread_attr_t attr;
* char *stk = _mapstack();
* char *stk = NewCosmoStack();
* pthread_attr_init(&attr);
* pthread_attr_setstack(&attr, stk, GetStackSize());
* pthread_create(&id, &attr, func, 0);
* pthread_attr_destroy(&attr);
* pthread_join(id, 0);
* _freestack(stk);
* FreeCosmoStack(stk);
*
* Your stack must have at least `PTHREAD_STACK_MIN` bytes, which
* Cosmpolitan Libc defines as `GetStackSize()`. It's a link-time
@ -44,7 +44,7 @@
* (e.g. kprintf) assumes that stack sizes are two-powers and are
* aligned to that two-power. Conformance isn't required since we
* say caveat emptor to those who don't maintain these invariants
* please consider using _mapstack() which always does it perfect
* please consider using NewCosmoStack(), which is always perfect
* or use `mmap(0, GetStackSize() << 1, ...)` for a bigger stack.
*
* Unlike pthread_attr_setstacksize(), this function permits just