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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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5
libc/mem/mem.h
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@ -26,7 +26,6 @@ char *strndup(const char *, size_t) paramsnonnull() mallocesque;
void *aligned_alloc(size_t, size_t) attributeallocalign((1))
attributeallocsize((2)) returnspointerwithnoaliases libcesque dontdiscard;
int posix_memalign(void **, size_t, size_t);
bool __grow(void *, size_t *, size_t, size_t) paramsnonnull((1, 2)) libcesque;
int mallopt(int, int);
int malloc_trim(size_t);
@ -59,6 +58,10 @@ size_t malloc_set_footprint_limit(size_t);
void malloc_inspect_all(void (*handler)(void *, void *, size_t, void *),
void *);
#ifdef COSMO
bool __grow(void *, size_t *, size_t, size_t) paramsnonnull((1, 2)) libcesque;
#endif
COSMOPOLITAN_C_END_
#endif /* !(__ASSEMBLER__ + __LINKER__ + 0) */
#endif /* COSMOPOLITAN_LIBC_MEM_MEM_H_ */