Add new syscall thr_new to create thread in atomic, it will
inherit signal mask from parent thread, setup TLS and stack, and user entry address. Also support POSIX thread's PTHREAD_SCOPE_PROCESS and PTHREAD_SCOPE_SYSTEM, sysctl is also provided to control the scheduler scope.
This commit is contained in:
parent
21fc316430
commit
c4bd610f58
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=145434
@ -49,14 +49,21 @@ extern int max_threads_per_proc;
|
||||
extern int max_groups_per_proc;
|
||||
|
||||
SYSCTL_DECL(_kern_threads);
|
||||
static int thr_scope_sys = 0;
|
||||
SYSCTL_INT(_kern_threads, OID_AUTO, thr_scope_sys, CTLFLAG_RW,
|
||||
&thr_scope_sys, 0, "sys or proc scope scheduling");
|
||||
static int thr_scope = 0;
|
||||
SYSCTL_INT(_kern_threads, OID_AUTO, thr_scope, CTLFLAG_RW,
|
||||
&thr_scope, 0, "sys or proc scope scheduling");
|
||||
|
||||
static int thr_concurrency = 0;
|
||||
SYSCTL_INT(_kern_threads, OID_AUTO, thr_concurrency, CTLFLAG_RW,
|
||||
&thr_concurrency, 0, "a concurrency value if not default");
|
||||
|
||||
static int create_thread(struct thread *td, mcontext_t *ctx,
|
||||
void (*start_func)(void *), void *arg,
|
||||
char *stack_base, size_t stack_size,
|
||||
char *tls_base,
|
||||
long *child_tid, long *parent_tid,
|
||||
int flags);
|
||||
|
||||
/*
|
||||
* System call interface.
|
||||
*/
|
||||
@ -64,103 +71,179 @@ int
|
||||
thr_create(struct thread *td, struct thr_create_args *uap)
|
||||
/* ucontext_t *ctx, long *id, int flags */
|
||||
{
|
||||
struct thread *newtd;
|
||||
ucontext_t ctx;
|
||||
long id;
|
||||
int error;
|
||||
struct ksegrp *kg, *newkg;
|
||||
struct proc *p;
|
||||
int scope_sys;
|
||||
|
||||
p = td->td_proc;
|
||||
kg = td->td_ksegrp;
|
||||
if ((error = copyin(uap->ctx, &ctx, sizeof(ctx))))
|
||||
return (error);
|
||||
|
||||
/* Have race condition but it is cheap */
|
||||
error = create_thread(td, &ctx.uc_mcontext, NULL, NULL,
|
||||
NULL, 0, NULL, uap->id, NULL, uap->flags);
|
||||
return (error);
|
||||
}
|
||||
|
||||
int
|
||||
thr_new(struct thread *td, struct thr_new_args *uap)
|
||||
/* struct thr_param * */
|
||||
{
|
||||
struct thr_param param;
|
||||
int error;
|
||||
|
||||
if (uap->param_size < sizeof(param))
|
||||
return (EINVAL);
|
||||
if ((error = copyin(uap->param, ¶m, sizeof(param))))
|
||||
return (error);
|
||||
error = create_thread(td, NULL, param.start_func, param.arg,
|
||||
param.stack_base, param.stack_size, param.tls_base,
|
||||
param.child_tid, param.parent_tid, param.flags);
|
||||
return (error);
|
||||
}
|
||||
|
||||
static int
|
||||
create_thread(struct thread *td, mcontext_t *ctx,
|
||||
void (*start_func)(void *), void *arg,
|
||||
char *stack_base, size_t stack_size,
|
||||
char *tls_base,
|
||||
long *child_tid, long *parent_tid,
|
||||
int flags)
|
||||
{
|
||||
stack_t stack;
|
||||
struct thread *newtd;
|
||||
struct ksegrp *kg, *newkg;
|
||||
struct proc *p;
|
||||
long id;
|
||||
int error, scope_sys, linkkg;
|
||||
|
||||
error = 0;
|
||||
p = td->td_proc;
|
||||
kg = td->td_ksegrp;
|
||||
|
||||
/* Have race condition but it is cheap. */
|
||||
if ((p->p_numksegrps >= max_groups_per_proc) ||
|
||||
(p->p_numthreads >= max_threads_per_proc)) {
|
||||
return (EPROCLIM);
|
||||
}
|
||||
|
||||
scope_sys = thr_scope_sys;
|
||||
/* Check PTHREAD_SCOPE_SYSTEM */
|
||||
scope_sys = (flags & THR_SYSTEM_SCOPE) != 0;
|
||||
|
||||
/* sysctl overrides user's flag */
|
||||
if (thr_scope == 1)
|
||||
scope_sys = 0;
|
||||
else if (thr_scope == 2)
|
||||
scope_sys = 1;
|
||||
|
||||
/* Initialize our td and new ksegrp.. */
|
||||
newtd = thread_alloc();
|
||||
if (scope_sys)
|
||||
newkg = ksegrp_alloc();
|
||||
else
|
||||
newkg = kg;
|
||||
|
||||
/*
|
||||
* Try the copyout as soon as we allocate the td so we don't have to
|
||||
* tear things down in a failure case below.
|
||||
* Try the copyout as soon as we allocate the td so we don't
|
||||
* have to tear things down in a failure case below.
|
||||
* Here we copy out tid to two places, one for child and one
|
||||
* for parent, because pthread can create a detached thread,
|
||||
* if parent wants to safely access child tid, it has to provide
|
||||
* its storage, because child thread may exit quickly and
|
||||
* memory is freed before parent thread can access it.
|
||||
*/
|
||||
id = newtd->td_tid;
|
||||
if ((error = copyout(&id, uap->id, sizeof(long)))) {
|
||||
if (scope_sys)
|
||||
ksegrp_free(newkg);
|
||||
thread_free(newtd);
|
||||
if ((child_tid != NULL &&
|
||||
(error = copyout(&id, child_tid, sizeof(long)))) ||
|
||||
(parent_tid != NULL &&
|
||||
(error = copyout(&id, parent_tid, sizeof(long))))) {
|
||||
thread_free(newtd);
|
||||
return (error);
|
||||
}
|
||||
|
||||
bzero(&newtd->td_startzero,
|
||||
__rangeof(struct thread, td_startzero, td_endzero));
|
||||
bcopy(&td->td_startcopy, &newtd->td_startcopy,
|
||||
__rangeof(struct thread, td_startcopy, td_endcopy));
|
||||
newtd->td_proc = td->td_proc;
|
||||
newtd->td_ucred = crhold(td->td_ucred);
|
||||
|
||||
cpu_set_upcall(newtd, td);
|
||||
|
||||
if (ctx != NULL) { /* old way to set user context */
|
||||
error = set_mcontext(newtd, ctx);
|
||||
if (error != 0) {
|
||||
thread_free(newtd);
|
||||
crfree(td->td_ucred);
|
||||
return (error);
|
||||
}
|
||||
} else {
|
||||
/* Set up our machine context. */
|
||||
stack.ss_sp = stack_base;
|
||||
stack.ss_size = stack_size;
|
||||
/* Set upcall address to user thread entry function. */
|
||||
cpu_set_upcall_kse(newtd, start_func, arg, &stack);
|
||||
/* Setup user TLS address and TLS pointer register. */
|
||||
cpu_set_user_tls(newtd, tls_base);
|
||||
}
|
||||
|
||||
if ((td->td_proc->p_flag & P_HADTHREADS) == 0) {
|
||||
/* Treat initial thread as it has PTHREAD_SCOPE_PROCESS. */
|
||||
p->p_procscopegrp = kg;
|
||||
mtx_lock_spin(&sched_lock);
|
||||
sched_set_concurrency(kg,
|
||||
thr_concurrency ? thr_concurrency : (2*mp_ncpus));
|
||||
mtx_unlock_spin(&sched_lock);
|
||||
}
|
||||
|
||||
linkkg = 0;
|
||||
if (scope_sys) {
|
||||
linkkg = 1;
|
||||
newkg = ksegrp_alloc();
|
||||
bzero(&newkg->kg_startzero,
|
||||
__rangeof(struct ksegrp, kg_startzero, kg_endzero));
|
||||
bcopy(&kg->kg_startcopy, &newkg->kg_startcopy,
|
||||
__rangeof(struct ksegrp, kg_startcopy, kg_endcopy));
|
||||
}
|
||||
|
||||
newtd->td_proc = td->td_proc;
|
||||
newtd->td_ucred = crhold(td->td_ucred);
|
||||
|
||||
/* Set up our machine context. */
|
||||
cpu_set_upcall(newtd, td);
|
||||
error = set_mcontext(newtd, &ctx.uc_mcontext);
|
||||
if (error != 0) {
|
||||
if (scope_sys)
|
||||
ksegrp_free(newkg);
|
||||
thread_free(newtd);
|
||||
crfree(td->td_ucred);
|
||||
goto out;
|
||||
}
|
||||
|
||||
/* Link the thread and kse into the ksegrp and make it runnable. */
|
||||
PROC_LOCK(td->td_proc);
|
||||
if (scope_sys) {
|
||||
sched_init_concurrency(newkg);
|
||||
sched_init_concurrency(newkg);
|
||||
PROC_LOCK(td->td_proc);
|
||||
} else {
|
||||
if ((td->td_proc->p_flag & P_HADTHREADS) == 0) {
|
||||
sched_set_concurrency(kg,
|
||||
thr_concurrency ? thr_concurrency : (2*mp_ncpus));
|
||||
/*
|
||||
* Try to create a KSE group which will be shared
|
||||
* by all PTHREAD_SCOPE_PROCESS threads.
|
||||
*/
|
||||
retry:
|
||||
PROC_LOCK(td->td_proc);
|
||||
if ((newkg = p->p_procscopegrp) == NULL) {
|
||||
PROC_UNLOCK(p);
|
||||
newkg = ksegrp_alloc();
|
||||
bzero(&newkg->kg_startzero,
|
||||
__rangeof(struct ksegrp, kg_startzero, kg_endzero));
|
||||
bcopy(&kg->kg_startcopy, &newkg->kg_startcopy,
|
||||
__rangeof(struct ksegrp, kg_startcopy, kg_endcopy));
|
||||
PROC_LOCK(p);
|
||||
if (p->p_procscopegrp == NULL) {
|
||||
p->p_procscopegrp = newkg;
|
||||
sched_init_concurrency(newkg);
|
||||
sched_set_concurrency(newkg,
|
||||
thr_concurrency ? thr_concurrency : (2*mp_ncpus));
|
||||
linkkg = 1;
|
||||
} else {
|
||||
PROC_UNLOCK(p);
|
||||
ksegrp_free(newkg);
|
||||
goto retry;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
td->td_proc->p_flag |= P_HADTHREADS;
|
||||
|
||||
td->td_proc->p_flag |= P_HADTHREADS;
|
||||
newtd->td_sigmask = td->td_sigmask;
|
||||
mtx_lock_spin(&sched_lock);
|
||||
if (scope_sys)
|
||||
if (linkkg)
|
||||
ksegrp_link(newkg, p);
|
||||
thread_link(newtd, newkg);
|
||||
mtx_unlock_spin(&sched_lock);
|
||||
PROC_UNLOCK(p);
|
||||
|
||||
/* let the scheduler know about these things. */
|
||||
mtx_lock_spin(&sched_lock);
|
||||
if (scope_sys)
|
||||
if (linkkg)
|
||||
sched_fork_ksegrp(td, newkg);
|
||||
sched_fork_thread(td, newtd);
|
||||
|
||||
TD_SET_CAN_RUN(newtd);
|
||||
if ((uap->flags & THR_SUSPENDED) == 0)
|
||||
/* if ((flags & THR_SUSPENDED) == 0) */
|
||||
setrunqueue(newtd, SRQ_BORING);
|
||||
|
||||
mtx_unlock_spin(&sched_lock);
|
||||
|
||||
out:
|
||||
return (error);
|
||||
}
|
||||
|
||||
|
@ -645,5 +645,7 @@
|
||||
453 MNOSTD { int auditctl(int cmd, char *path); }
|
||||
454 MSTD { int _umtx_op(struct umtx *umtx, int op, long id, void *uaddr,\
|
||||
void *uaddr2); }
|
||||
455 MSTD { int thr_new(struct thr_param *param, int param_size); }
|
||||
|
||||
; Please copy any additions and changes to the following compatability tables:
|
||||
; sys/compat/freebsd32/syscalls.master
|
||||
|
@ -30,7 +30,23 @@
|
||||
#ifndef _SYS_THR_H_
|
||||
#define _SYS_THR_H_
|
||||
|
||||
#define THR_SUSPENDED 0x0001 /* Create the thread in the suspended state. */
|
||||
/* Create the thread in the suspended state. */
|
||||
#define THR_SUSPENDED 0x0001
|
||||
/* Create the system scope thread. */
|
||||
#define THR_SYSTEM_SCOPE 0x0002
|
||||
|
||||
struct thr_param {
|
||||
void (*start_func)(void *); /* thread entry function. */
|
||||
void *arg; /* argument for entry function. */
|
||||
char *stack_base; /* stack base address. */
|
||||
size_t stack_size; /* stack size. */
|
||||
char *tls_base; /* tls base address. */
|
||||
size_t tls_size; /* tls size. */
|
||||
long *child_tid; /* address to store new TID. */
|
||||
long *parent_tid; /* parent accesses the new TID here. */
|
||||
int flags; /* thread flags. */
|
||||
void *spare[4]; /* TODO: cpu affinity mask etc. */
|
||||
};
|
||||
|
||||
/*
|
||||
* See pthread_*
|
||||
@ -38,6 +54,7 @@
|
||||
#ifndef _KERNEL
|
||||
|
||||
int thr_create(ucontext_t *ctx, long *id, int flags);
|
||||
int thr_new(struct thr_param *param, int param_size);
|
||||
int thr_self(long *id);
|
||||
void thr_exit(long *state);
|
||||
int thr_kill(long id, int sig);
|
||||
|
Loading…
Reference in New Issue
Block a user