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#include "pthread_impl.h"
#include <setjmp.h>
struct thread {
struct thread *next;
pthread_t td;
jmp_buf jb;
void *tmp, *stack;
};
struct ctx {
struct thread *list;
pthread_t caller;
pid_t pid;
size_t cnt;
pthread_barrier_t barrier;
};
static void restart_thread(pthread_t self)
{
struct thread *t = self->start_arg;
self->start_arg = t->tmp;
self->pid = getpid();
longjmp(t->jb, 1);
}
static void do_forkall(void *p)
{
struct ctx *c = p, *volatile cv = c;
char tmpstack[2048];
struct thread *tp, t = {
.td = __pthread_self(),
.next = c->list,
.stack = tmpstack+1024
};
if (t.td != c->caller) {
c->cnt++;
t.tmp = t.td->start_arg;
t.td->start_arg = &t;
if (setjmp(t.jb)) {
c = cv;
if (c->pid) return;
pthread_barrier_wait(&c->barrier);
return;
}
c->list = &t;
__synccall_wait();
return;
}
c->pid = syscall(SYS_fork);
if (c->pid) return;
pthread_barrier_init(&c->barrier, 0, c->cnt);
for (tp=c->list; tp; tp=tp->next)
if (__uniclone(tp->stack, restart_thread, tp->td) < 0)
_exit(127);
pthread_barrier_wait(&c->barrier);
}
pid_t forkall()
{
struct ctx c = { .caller = pthread_self() };
__synccall(do_forkall, &c);
return c.pid;
}
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