Update of /cvsroot/sbcl/sbcl/src/runtime
In directory sc8-pr-cvs1:/tmp/cvs-serv3612/src/runtime
Added Files:
Tag: dan_native_threads_3_branch
thread.c thread.h
Log Message:
New files
--- NEW FILE: thread.c ---
#include <stdlib.h>
#include <stdio.h>
#include <sched.h>
#include <stddef.h>
#ifndef CLONE_PARENT /* lameass glibc 2.2 doesn't define this */
#define CLONE_PARENT 0x00008000 /* even though the manpage documents it */
#endif
#include "runtime.h"
#include "sbcl.h"
#include "validate.h" /* for CONTROL_STACK_SIZE etc */
#include "thread.h"
#include "arch.h"
#include "target-arch-os.h"
#include "os.h"
#include "globals.h"
#ifdef LISP_FEATURE_GENCGC
#include "gencgc.h"
#endif
#include "dynbind.h"
#include "genesis/cons.h"
#define ALIEN_STACK_SIZE (1*1024*1024) /* 1Mb size chosen at random */
int dynamic_values_bytes=4096*sizeof(lispobj); /* same for all threads */
struct thread *all_threads;
lispobj all_threads_lock;
extern struct interrupt_data * global_interrupt_data;
void get_spinlock(lispobj *word,int value);
/* this is the first thing that clone() runs in the child (which is
* why the silly calling convention). Basically it calls the user's
* requested lisp function after doing arch_os_thread_init and
* whatever other bookkeeping needs to be done
*/
/* set go to 0 to stop the thread before it starts. Convenient if you
* want to attach a debugger to it before it does anything */
volatile int go=1;
int
new_thread_trampoline(struct thread *th)
{
lispobj function;
function = th->unbound_marker;
if(go==0) {
fprintf(stderr, "/pausing 0x%lx(%d,%d) before
new_thread_trampoline(0x%lx)\n",
(unsigned long)th,th->pid,getpid(),(unsigned long)function);
while(go==0) ;
fprintf(stderr, "/continue\n");
}
th->unbound_marker = UNBOUND_MARKER_WIDETAG;
/* wait here until our thread is linked into all_threads: see below */
while(th->pid<1) sched_yield();
if(arch_os_thread_init(th)==0)
return 1; /* failure. no, really */
return funcall0(function);
}
/* this is called from any other thread to create the new one, and
* initialize all parts of it that can be initialized from another
* thread
*/
pid_t create_thread(lispobj initial_function) {
union per_thread_data *per_thread;
struct thread *th=0; /* subdue gcc */
void *spaces=0;
pid_t kid_pid;
/* may as well allocate all the spaces at once: it saves us from
* having to decide what to do if only some of the allocations
* succeed */
spaces=os_validate(0,
THREAD_CONTROL_STACK_SIZE+
BINDING_STACK_SIZE+
ALIEN_STACK_SIZE+
dynamic_values_bytes+
32*SIGSTKSZ
);
if(!spaces) goto cleanup;
per_thread=(union per_thread_data *)
(spaces+
THREAD_CONTROL_STACK_SIZE+
BINDING_STACK_SIZE+
ALIEN_STACK_SIZE);
th=&per_thread->thread;
if(all_threads) {
memcpy(per_thread,arch_os_get_current_thread(),
dynamic_values_bytes);
} else {
int i;
for(i=0;i<(dynamic_values_bytes/sizeof(lispobj));i++)
per_thread->dynamic_values[i]=UNBOUND_MARKER_WIDETAG;
if(SymbolValue(FREE_TLS_INDEX,0)==UNBOUND_MARKER_WIDETAG)
SetSymbolValue
(FREE_TLS_INDEX,
make_fixnum(MAX_INTERRUPTS+
sizeof(struct thread)/sizeof(lispobj)),
0);
#define STATIC_TLS_INIT(sym,field) \
((struct symbol *)(sym-OTHER_POINTER_LOWTAG))->tls_index= \
make_fixnum(THREAD_SLOT_OFFSET_WORDS(field))
STATIC_TLS_INIT(BINDING_STACK_START,binding_stack_start);
STATIC_TLS_INIT(BINDING_STACK_POINTER,binding_stack_pointer);
STATIC_TLS_INIT(CONTROL_STACK_START,control_stack_start);
STATIC_TLS_INIT(ALIEN_STACK,alien_stack_pointer);
STATIC_TLS_INIT(PSEUDO_ATOMIC_ATOMIC,pseudo_atomic_atomic);
STATIC_TLS_INIT(PSEUDO_ATOMIC_INTERRUPTED,pseudo_atomic_interrupted);
#undef STATIC_TLS_INIT
}
th->control_stack_start = spaces;
th->binding_stack_start=
(lispobj*)((void*)th->control_stack_start+THREAD_CONTROL_STACK_SIZE);
th->alien_stack_start=
(lispobj*)((void*)th->binding_stack_start+BINDING_STACK_SIZE);
th->binding_stack_pointer=th->binding_stack_start;
th->this=th;
th->pid=0;
#ifdef LISP_FEATURE_STACK_GROWS_DOWNWARD_NOT_UPWARD
th->alien_stack_pointer=((void *)th->alien_stack_start
+ ALIEN_STACK_SIZE-4); /* naked 4. FIXME */
#else
th->alien_stack_pointer=((void *)th->alien_stack_start);
#endif
th->pseudo_atomic_interrupted=0;
/* runtime.c used to set PSEUDO_ATOMIC_ATOMIC =1 globally. I'm not
* sure why, but it appears to help */
th->pseudo_atomic_atomic=make_fixnum(1);
gc_set_region_empty(&th->alloc_region);
bind_variable(CURRENT_CATCH_BLOCK,make_fixnum(0),th);
bind_variable(CURRENT_UNWIND_PROTECT_BLOCK,make_fixnum(0),th);
bind_variable(FREE_INTERRUPT_CONTEXT_INDEX,make_fixnum(0),th);
bind_variable(INTERRUPT_PENDING, NIL,th);
bind_variable(INTERRUPTS_ENABLED,T,th);
th->interrupt_data=malloc(sizeof (struct interrupt_data));
if(all_threads)
memcpy(th->interrupt_data,arch_os_get_current_thread()->interrupt_data,
sizeof (struct interrupt_data));
else
memcpy(th->interrupt_data,global_interrupt_data,
sizeof (struct interrupt_data));
#if defined(LISP_FEATURE_X86) && defined (LISP_FEATURE_LINUX)
th->unbound_marker=initial_function;
kid_pid=
clone(new_thread_trampoline,
(((void*)th->control_stack_start)+THREAD_CONTROL_STACK_SIZE-4),
(((getpid()!=parent_pid)?(CLONE_PARENT):0)
|SIGALRM|CLONE_VM),th);
if(kid_pid<=0)
goto cleanup;
#else
#error this stuff presently only works on x86 Linux
#endif
get_spinlock(&all_threads_lock,kid_pid);
th->next=all_threads;
all_threads=th;
/* note that th->pid is 0 at this time. We rely on all_threads_lock
* to ensure that we don't have >1 thread with pid=0 on the list at once
*/
protect_control_stack_guard_page(th->pid,1);
all_threads_lock=0;
th->pid=kid_pid; /* child will not start until this is set */
return th->pid;
cleanup:
/* if(th && th->tls_cookie>=0) os_free_tls_pointer(th); */
if(spaces) os_invalidate(spaces,
THREAD_CONTROL_STACK_SIZE+BINDING_STACK_SIZE+
ALIEN_STACK_SIZE+dynamic_values_bytes);
return 0;
}
void destroy_thread (struct thread *th)
{
/* precondition: the unix task has already been killed and exited.
* This is called by the parent */
gc_alloc_update_page_tables(0, &th->alloc_region);
get_spinlock(&all_threads_lock,th->pid);
if(th==all_threads)
all_threads=th->next;
else {
struct thread *th1=all_threads;
while(th1->next!=th) th1=th1->next;
th1->next=th->next; /* unlink */
}
all_threads_lock=0;
/* if(th && th->tls_cookie>=0) os_free_tls_pointer(th); */
os_invalidate((os_vm_address_t) th->control_stack_start,
THREAD_CONTROL_STACK_SIZE+BINDING_STACK_SIZE+
ALIEN_STACK_SIZE+dynamic_values_bytes+
32*SIGSTKSZ);
}
struct thread *find_thread_by_pid(pid_t pid)
{
struct thread *th;
for_each_thread(th)
if(th->pid==pid) return th;
return 0;
}
struct mutex {
lispobj header,type,*name,*value,queuelock, *queue;
};
void get_spinlock(lispobj *word,int value)
{
u32 new_val=0;
do {
asm ("xor %0,%0;cmpxchg %1,%2"
: "=a" (new_val)
: "r" (value), "m" (word)
: "memory", "cc");
} while(new_val==0);
}
void add_thread_to_queue(int pid, lispobj mutex_p)
{
sigset_t oldset,newset;
struct mutex *mutex=(struct mutex *)native_pointer(mutex_p);
struct cons *cons;
sigemptyset(&newset);
sigaddset(&newset,SIGALRM);
sigprocmask(SIG_BLOCK, &newset, &oldset);
get_spinlock(&(mutex->queuelock),pid);
cons=alloc_cons(make_fixnum(pid),mutex->queue);
mutex->queue=cons;
mutex->queuelock=0;
sigwaitinfo(&newset,0);
sigprocmask(SIG_SETMASK,&oldset,0);
}
--- NEW FILE: thread.h ---
#if !defined(_INCLUDE_THREAD_H_)
#define _INCLUDE_THREAD_H_
#include <sys/types.h>
#include <unistd.h>
#include "runtime.h"
#include "sbcl.h"
#include "os.h"
#include "interrupt.h"
#ifdef LISP_FEATURE_GENCGC
#include "gencgc-alloc-region.h"
#else
#error "threading doesn't work with cheney gc yet"
#endif
#include "genesis/symbol.h"
#include "genesis/static-symbols.h"
#include "genesis/thread.h"
#define THREAD_SLOT_OFFSET_WORDS(c) \
(offsetof(struct thread,c)/(sizeof (struct thread *)))
union per_thread_data {
struct thread thread;
lispobj dynamic_values[1]; /* actually more like 4000 or so */
};
extern struct thread *all_threads;
extern int dynamic_values_bytes;
extern struct thread *find_thread_by_pid(pid_t pid);
#define for_each_thread(th) for(th=all_threads;th;th=th->next)
static inline lispobj SymbolValue(u32 tagged_symbol_pointer, void *thread) {
struct symbol *sym= (struct symbol *)
(tagged_symbol_pointer-OTHER_POINTER_LOWTAG);
if(thread && sym->tls_index) {
lispobj r=
((union per_thread_data *)thread)
->dynamic_values[fixnum_value(sym->tls_index)];
if(r!=UNBOUND_MARKER_WIDETAG) return r;
}
return sym->value;
}
static inline lispobj SymbolTlValue(u32 tagged_symbol_pointer, void *thread) {
struct symbol *sym= (struct symbol *)
(tagged_symbol_pointer-OTHER_POINTER_LOWTAG);
return ((union per_thread_data *)thread)
->dynamic_values[fixnum_value(sym->tls_index)];
}
static inline void SetSymbolValue(u32 tagged_symbol_pointer,lispobj val, void
*thread) {
struct symbol *sym= (struct symbol *)
(tagged_symbol_pointer-OTHER_POINTER_LOWTAG);
if(thread && sym->tls_index) {
lispobj *pr= &(((union per_thread_data *)thread)
->dynamic_values[fixnum_value(sym->tls_index)]);
if(*pr!= UNBOUND_MARKER_WIDETAG) {
*pr=val;
return;
}
}
sym->value = val;
}
static inline void SetTlSymbolValue(u32 tagged_symbol_pointer,lispobj val, void
*thread) {
struct symbol *sym= (struct symbol *)
(tagged_symbol_pointer-OTHER_POINTER_LOWTAG);
((union per_thread_data *)thread)
->dynamic_values[fixnum_value(sym->tls_index)]
=val;
}
#endif /* _INCLUDE_THREAD_H_ */
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