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swapcontext wrapper can not be implemented in C, the stack pointer saved in

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the context becomes invalid when the function returns, same as setjmp,
it must be implemented in assemble language, see discussions in PR
misc/177624.
This commit is contained in:
David Xu 2013-04-10 02:40:03 +00:00
parent ae551da6a1
commit 31c18e29cc
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=249323
1 changed files with 1 additions and 10 deletions
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11
lib/libthr/thread/thr_sig.c
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@ -737,13 +737,4 @@ _setcontext(const ucontext_t *ucp)
return __sys_setcontext(&uc);
}
__weak_reference(_swapcontext, swapcontext);
int
_swapcontext(ucontext_t *oucp, const ucontext_t *ucp)
{
ucontext_t uc;
(void) memcpy(&uc, ucp, sizeof(uc));
remove_thr_signals(&uc.uc_sigmask);
return __sys_swapcontext(oucp, &uc);
}
__weak_reference(__sys_swapcontext, swapcontext);