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Use longjmp at setjmp where possible

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Where we can we should use longjmp and setjmp in preference to swapcontext/
setcontext as they seem to be more performant.

Reviewed-by: Rich Salz <rsalz@openssl.org>
This commit is contained in:
Matt Caswell
2015-05-05 15:08:39 +01:00
parent 4cfa6204e8
commit 7070e5ca2f
4 changed files with 29 additions and 13 deletions
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24
crypto/async/arch/async_posix.h
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@@ -62,20 +62,34 @@
# define ASYNC_ARCH
# include <ucontext.h>
# include <setjmp.h>
# include "e_os.h"
extern __thread ASYNC_CTX *sysvctx;
typedef struct async_fibre_st {
ucontext_t fibre;
jmp_buf env;
int env_init;
} ASYNC_FIBRE;
# define ASYNC_set_ctx(nctx) (sysvctx = (nctx))
# define ASYNC_get_ctx() (sysvctx)
# define ASYNC_FIBRE_swapcontext(o,n,r) \
((r)? \
!swapcontext(&(o)->fibre, &(n)->fibre) \
: \
!setcontext(&(n)->fibre))
static inline int ASYNC_FIBRE_swapcontext(ASYNC_FIBRE *o, ASYNC_FIBRE *n, int r)
{
o->env_init = 1;
if (!r || !setjmp(o->env)) {
if (n->env_init)
longjmp(n->env, 1);
else
setcontext(&n->fibre);
}
return 1;
}
# define ASYNC_FIBRE_makecontext(c) \
(ASYNC_FIBRE_init(c) \
&& !getcontext(&(c)->fibre) \