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Use thr_new syscall to create a new thread, obscure context operations

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is no longer needed.
This commit is contained in:
David Xu 2005-04-23 02:48:59 +00:00
parent 40f2d4dafd
commit 80c9676e8b
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=145436
3 changed files with 39 additions and 24 deletions
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1
lib/libthr/Makefile
View File

@ -30,6 +30,7 @@ CFLAGS+=-g
PRECIOUSLIB=
.include "${.CURDIR}/arch/${MACHINE_ARCH}/Makefile.inc"
.include "${.CURDIR}/support/Makefile.inc"
.include "${.CURDIR}/sys/Makefile.inc"
.include "${.CURDIR}/thread/Makefile.inc"

22
lib/libthr/support/Makefile.inc Normal file
View File

@ -0,0 +1,22 @@
# $FreeBSD$
.PATH: ${.CURDIR}/support ${.CURDIR}/../libc/gen ${.CURDIR}/../libc/string
.PATH: ${.CURDIR}/../libc/${MACHINE_ARCH}/sys
CFLAGS+= -I${.CURDIR}/../libc/${MACHINE_ARCH}
SYSCALLS= thr_new
SYSCALL_SRC= ${SYSCALLS:S/$/.S/}
SYSCALL_OBJ= ${SYSCALLS:S/$/.So/}
${SYSCALL_SRC}:
printf '#include "SYS.h"\nRSYSCALL(${.PREFIX})\n' > ${.TARGET}
LIBC_OBJS=
SOBJS+= thr_libc.So
CLEANFILES+= ${SYSCALL_SRC} ${SYSCALL_OBJ} ${LIBC_OBJS}
thr_libc.So: ${SYSCALL_OBJ} ${LIBC_OBJS}
${CC} -fPIC -nostdlib -o ${.TARGET} -r ${.ALLSRC}

40
lib/libthr/thread/thr_create.c
View File

@ -53,9 +53,8 @@ int
_pthread_create(pthread_t * thread, const pthread_attr_t * attr,
void *(*start_routine) (void *), void *arg)
{
ucontext_t uc;
sigset_t sigmask, oldsigmask;
struct pthread *curthread, *new_thread;
struct thr_param param;
int ret = 0, locked;
_thr_check_init();
@ -70,6 +69,8 @@ _pthread_create(pthread_t * thread, const pthread_attr_t * attr,
if ((new_thread = _thr_alloc(curthread)) == NULL)
return (EAGAIN);
memset(&param, 0, sizeof(param));
if (attr == NULL || *attr == NULL)
/* Use the default thread attributes: */
new_thread->attr = _pthread_attr_default;
@ -108,12 +109,6 @@ _pthread_create(pthread_t * thread, const pthread_attr_t * attr,
new_thread->arg = arg;
new_thread->cancelflags = PTHREAD_CANCEL_ENABLE |
PTHREAD_CANCEL_DEFERRED;
getcontext(&uc);
SIGFILLSET(uc.uc_sigmask);
uc.uc_stack.ss_sp = new_thread->attr.stackaddr_attr;
uc.uc_stack.ss_size = new_thread->attr.stacksize_attr;
makecontext(&uc, (void (*)(void))thread_start, 1, new_thread);
/*
* Check if this thread is to inherit the scheduling
* attributes from its parent:
@ -146,15 +141,7 @@ _pthread_create(pthread_t * thread, const pthread_attr_t * attr,
if (new_thread->attr.suspend == THR_CREATE_SUSPENDED)
new_thread->flags = THR_FLAGS_SUSPENDED;
new_thread->state = PS_RUNNING;
/*
* Thread created by thr_create() inherits currrent thread
* sigmask, however, before new thread setup itself correctly,
* it can not handle signal, so we should masks all signals here.
*/
SIGFILLSET(sigmask);
SIGDELSET(sigmask, SIGTRAP);
__sys_sigprocmask(SIG_SETMASK, &sigmask, &oldsigmask);
new_thread->sigmask = oldsigmask;
/* Add the new thread. */
_thr_link(curthread, new_thread);
/* Return thread pointer eariler so that new thread can use it. */
@ -164,9 +151,19 @@ _pthread_create(pthread_t * thread, const pthread_attr_t * attr,
locked = 1;
} else
locked = 0;
param.start_func = (void (*)(void *)) thread_start;
param.arg = new_thread;
param.stack_base = new_thread->attr.stackaddr_attr;
param.stack_size = new_thread->attr.stacksize_attr;
param.tls_base = (char *)new_thread->tcb;
param.tls_size = sizeof(struct tcb);
param.child_tid = &new_thread->tid;
param.parent_tid = &new_thread->tid;
param.flags = 0;
if (new_thread->attr.flags & PTHREAD_SCOPE_SYSTEM)
param.flags |= THR_SYSTEM_SCOPE;
/* Schedule the new thread. */
ret = thr_create(&uc, &new_thread->tid, 0);
__sys_sigprocmask(SIG_SETMASK, &oldsigmask, NULL);
ret = thr_new(&param, sizeof(param));
if (ret != 0) {
if (locked)
THR_THREAD_UNLOCK(curthread, new_thread);
@ -219,11 +216,6 @@ free_stack(struct pthread *curthread, struct pthread_attr *pattr)
static void
thread_start(struct pthread *curthread)
{
_tcb_set(curthread->tcb);
/* Thread was created with all signals blocked, unblock them. */
__sys_sigprocmask(SIG_SETMASK, &curthread->sigmask, NULL);
if (curthread->flags & THR_FLAGS_NEED_SUSPEND)
_thr_suspend_check(curthread);