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libthread: use mmap to allocate OpenBSD stacks

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Should fix faults on OpenBSD.

Fixes #218.
Fixes #226.
This commit is contained in:
Russ Cox 2020-01-14 12:40:09 -05:00
parent 4ae529dbfe
commit 8c573cab68
6 changed files with 61 additions and 8 deletions
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9
src/libthread/thread.c
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@ -109,7 +109,7 @@ threadalloc(void (*fn)(void*), void *arg, uint stack)
ulong z;
/* allocate the task and stack together */
t = malloc(sizeof *t+stack);
t = malloc(sizeof *t);
if(t == nil)
sysfatal("threadalloc malloc: %r");
memset(t, 0, sizeof *t);
@ -122,7 +122,9 @@ threadalloc(void (*fn)(void*), void *arg, uint stack)
/* do a reasonable initialization */
if(stack == 0)
return t;
t->stk = (uchar*)(t+1);
t->stk = _threadstkalloc(stack);
if(t->stk == nil)
sysfatal("threadalloc malloc stack: %r");
t->stksize = stack;
memset(&t->context.uc, 0, sizeof t->context.uc);
sigemptyset(&zero);
@ -353,6 +355,7 @@ Top:
delthreadinproc(p, t);
p->nthread--;
/*print("nthread %d\n", p->nthread); */
_threadstkfree(t->stk, t->stksize);
free(t);
}
@ -509,6 +512,8 @@ needstack(int n)
_Thread *t;
t = proc()->thread;
if(t->stk == nil)
return;
if((char*)&t <= (char*)t->stk
|| (char*)&t - (char*)t->stk < 256+n){