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xthread.cpp
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xthread.cpp
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/*
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
/*
* @file xthread.cpp
* @brief Functions to manage thread related spawn, join.
*
* @author Emery Berger <http://www.cs.umass.edu/~emery>
* @author Tongping Liu <http://www.cs.umass.edu/~tonyliu>
*/
#include <new>
#include <pthread.h>
#include <sched.h>
#include <signal.h>
#include <stddef.h>
#include <stddef.h>
#include <syscall.h>
#include <unistd.h>
#include "debug.h"
#include "xrun.h"
#include "xthread.h"
void *xthread::spawn(const void *caller,
threadFunction *fn,
void *arg,
int parent_index) {
// Allocate an object to hold the thread's return value.
void *buf = allocateSharedObject(4096);
static_assert(4096 > sizeof(ThreadStatus),
"Not enough space to hold ThreadStatus");
ThreadStatus *t = new (buf)ThreadStatus;
return forkSpawn(caller, fn, t, arg, parent_index);
}
/// @brief Get thread index for this thread.
int xthread::getThreadIndex(void *v) {
ASSERT(v != NULL);
ThreadStatus *t = (ThreadStatus *)v;
return t->threadIndex;
}
/// @brief Get thread tid for this thread.
int xthread::getThreadPid(void *v) {
ASSERT(v != NULL);
ThreadStatus *t = (ThreadStatus *)v;
return t->tid;
}
/// @brief Do pthread_join.
void xthread::join(void *v, void **result) {
ThreadStatus *t = (ThreadStatus *)v;
DEBUGF("%d: Joining thread %d", getpid(), t->tid);
// Grab the thread result from the status structure (set by the thread),
// reclaim the memory, and return that result.
if (result != NULL) {
*result = t->retval;
}
// Free the shared object held by this thread.
freeSharedObject(t, 4096);
}
/// @brief Cancel one thread. Send out a SIGKILL signal to that thread
int xthread::cancel(void *v) {
ThreadStatus *t = (ThreadStatus *)v;
int threadindex = t->threadIndex;
kill(t->tid, SIGKILL);
// Free the shared object held by this thread.
freeSharedObject(t, 4096);
return threadindex;
}
int xthread::thread_kill(void *v, int sig)
{
int threadindex;
ThreadStatus *t = (ThreadStatus *)v;
threadindex = t->threadIndex;
kill(t->tid, sig);
freeSharedObject(t, 4096);
return threadindex;
}
void *xthread::forkSpawn(const void *caller,
threadFunction *fn,
ThreadStatus *t,
void *arg,
int parent_index) {
// Use fork to create the effect of a thread spawn.
// FIXME:: For current process, we should close share.
// children to use MAP_PRIVATE mapping. Or just let child to do that in the
// beginning.
int child = syscall(SYS_clone, CLONE_FS | CLONE_FILES | SIGCHLD, (void *)0);
if (child == -1) {
// fork failed, handle failure in parent
return NULL;
} else if (child) {
// I need to wait until the child has waited on creation barrier
// sucessfully.
_run.waitChildRegistered();
return (void *)t;
} else {
pid_t mypid = syscall(SYS_getpid);
setId(mypid);
int threadindex = _run.childRegister(mypid, parent_index);
t->threadIndex = threadindex;
t->tid = mypid;
_run.waitParentNotify();
_nestingLevel++;
run_thread(caller, fn, t, arg);
_nestingLevel--;
_exit(0);
return NULL;
}
}
// @brief Execute the thread.
void xthread::run_thread(const void *caller,
threadFunction *fn,
ThreadStatus *t,
void *arg) {
_run.atomicBegin(caller);
void *result = fn(arg);
_run.threadDeregister(caller);
t->retval = result;
}