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/* -*- mode: c -*- */
/*
threads.d -- Posix threads.
*/
/*
Copyright (c) 2003, Juan Jose Garcia Ripoll.
Copyright (c) 2010-2012, Jean-Claude Beaudoin.
MKCL is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 3 of the License, or (at your option) any later version.
See file '../../Copyright' for full details.
*/
#include <mkcl/mkcl.h>
#include <mkcl/mkcl-gc.h>
#include <mkcl/mkcl-math.h>
#include <mkcl/mkcl-inl.h>
#include <mkcl/internal.h>
#include <limits.h>
#include <string.h>
#include <errno.h>
#include <time.h>
#include <stdlib.h>
#include <signal.h>
#ifdef HAVE_GETTIMEOFDAY
# include <sys/time.h>
#endif
#ifdef HAVE_SCHED_YIELD
# include <sched.h>
#endif
#ifdef __linux
/* This _true_pthread_join gives you direct access to the real pthread_join, not the Boehm's GC wrapped one. */
static int _true_pthread_join(pthread_t thread, void ** retval);
#endif /* __linux */
static void setup_thread_bindings(MKCL, mkcl_object initial_bindings);
#ifdef MKCL_WINDOWS
char * mkcl_handle_debug_name(MKCL, char * prefix)
{
static unsigned long count = 0;
static const char * const format = "MKCL(%lu): %s %lu";
DWORD pid = GetCurrentProcessId();
char * name = mkcl_alloc_atomic(env, sizeof(format) + 12 + strlen(prefix) + 12);
sprintf(name, format, pid, prefix, count++);
return name;
}
#endif
#ifdef MKCL_WINDOWS
static DWORD cl_env_key;
#else
static pthread_key_t cl_env_key;
#endif
const mkcl_env mkcl_thread_env(void)
{
#ifdef MKCL_WINDOWS
return TlsGetValue(cl_env_key);
#else
return pthread_getspecific(cl_env_key);
#endif
}
static void
mkcl_set_thread_env(MKCL)
{
#if defined(MKCL_WINDOWS)
if (!TlsSetValue(cl_env_key, env))
mkcl_FEwin32_error(env, "mkcl_set_thread_env failed on TlsSetValue", 0);
#else
if (pthread_setspecific(cl_env_key, env))
mkcl_FElibc_error(env, "mkcl_set_thread_env failed on pthread_setspecific()", 0);
#endif
}
/*----------------------------------------------------------------------
*/
inline mkcl_object
mkcl_current_thread(MKCL)
{
return env->own_thread;
}
mkcl_object mk_mt_current_thread(MKCL)
{
@(return mkcl_current_thread(env));
}
/*----------------------------------------------------------------------
* THREAD OBJECT
*/
inline static void
mkcl_assert_type_thread(MKCL, mkcl_object o)
{
if (mkcl_type_of(o) != mkcl_t_thread)
mkcl_FEwrong_type_argument(env, @'mt::thread', o);
}
static void
thread_final_cleanup(MKCL, mkcl_object thread)
{
/* This routine performs some cleanup before a thread is completely
* done. For instance, it has to remove the associated thread
* object from the list, and it has to dealloc some memory.
*/
/* const mkcl_env env = thread->thread.env; */
thread->thread.status = mkcl_thread_done;
env->disable_interrupts = 2; /* This prevents any interrupts, even forced. */
#if MKCL_DEBUG_INTERRUPT_MASK
env->interrupt_disabler_lineno = __LINE__;
env->interrupt_disabler_file = __FILE__;
#endif
mkcl_reset_stacks(env);
env->fpe_control_bits = 0;
mkcl_set_thread_env(NULL);
if (thread->thread.detached
|| thread->thread.result_value == @':imported'
|| thread->thread.result_value == @':imported-and-gc-registered')
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{
mkcl_remove_thread_from_global_thread_list(env, thread);
}
#if __unix
if (thread->thread.running_lock) /* should not be here */
{
pthread_mutex_destroy(thread->thread.running_lock);
thread->thread.running_lock = NULL;
}
sigemptyset(&thread->thread.saved_sigmask);
#endif
/* cleanup the private state of the thread */
thread->thread.interrupt = mk_cl_Cnil;
thread->thread.sigmask_frs_marker = NULL;
thread->thread.resume_handler_ran = FALSE;
thread->thread.interrupt_count = 0;
{
int i, j;
for (i = 0; i < MKCL_MAX_INTERRUPTS; i++)
{
thread->thread.interrupted_threads[i].thread_ident = 0;
thread->thread.interrupted_threads[i].cs_org = NULL;
thread->thread.interrupted_threads[i].cs_limit = NULL;
thread->thread.interrupted_threads[i].cs_size = 0;
thread->thread.interrupted_threads[i].cs_overflow_size = 0;
thread->thread.interrupted_threads[i].cs_overflowing = FALSE;
thread->thread.interrupted_threads[i].nvalues = 0;
for (j = 0; j < MKCL_MULTIPLE_VALUES_LIMIT; j++)
thread->thread.interrupted_threads[i].values[j] = mk_cl_Cnil;
}
}
}
#ifdef MKCL_WINDOWS
# if 0
/* For use with direct call to CreateThread */
typedef DWORD thread_value_t;
# define CALL_CONV WINAPI
# else
/* For calls to _beginthreadex */
typedef unsigned thread_value_t;
# define CALL_CONV __stdcall
# endif
#elif defined(__linux)
typedef void * thread_value_t;
# define CALL_CONV
#endif
static void push_on_global_thread_list(MKCL, mkcl_object thread)
{
volatile bool locked = false;
MKCL_UNWIND_PROTECT_BEGIN(env) {
MKCL_LIBC_NO_INTR(env, (MKCL_THREAD_LIST_LOCK(), locked = true));
mkcl_core.threads = MKCL_CONS(env, thread, mkcl_core.threads);
} MKCL_UNWIND_PROTECT_EXIT {
if (locked) MKCL_THREAD_LIST_UNLOCK();
} MKCL_UNWIND_PROTECT_END;
}
void mkcl_remove_thread_from_global_thread_list(MKCL, mkcl_object thread)
{
volatile bool locked = false;
MKCL_UNWIND_PROTECT_BEGIN(env) {
MKCL_LIBC_NO_INTR(env, (MKCL_THREAD_LIST_LOCK(), locked = true));
mkcl_core.threads = mkcl_remove_eq(env, thread, mkcl_core.threads);
} MKCL_UNWIND_PROTECT_EXIT {
if (locked) MKCL_THREAD_LIST_UNLOCK();
} MKCL_UNWIND_PROTECT_END;
}
void mkcl_register_thread_as_active(MKCL, mkcl_object thread)
{
thread->thread.status = mkcl_thread_active;
push_on_global_thread_list(env, thread);
}
void mkcl_setup_thread_lisp_context(MKCL, char * const stack_mark_address)
{
mkcl_object thread = env->own_thread;
mkcl_set_thread_env(env);
thread->thread.tid = mkcl_gettid();
mkcl_init_call_stack_overflow_area(env, stack_mark_address);
mk_si_clear_all_fpe(env);
mk_si_enable_fpe(env, @':default');
if (!mkcl_Null(thread->thread.initial_bindings))
setup_thread_bindings(env, thread->thread.initial_bindings);
mkcl_bds_bind(env, @'mt::*thread*', thread);
mkcl_bds_bind(env, @'mkcl::*current-working-directory*', mk_cl_Cnil);
mkcl_bds_bind(env, @'mkcl::*all-current-working-directories*', mk_cl_Cnil);
mkcl_bds_bind(env, @'si::*dynamic-cons-stack*', mk_cl_Cnil);
mk_si_trim_dynamic_cons_stack(env);
}
void mkcl_cleanup_thread_lisp_context(MKCL)
{
#if 0
mkcl_bds_unwind1(env); /* si::*dynamic-cons-stack* */
mkcl_bds_unwind1(env); /* mkcl::*all-current-working-directories* */
mkcl_bds_unwind1(env); /* mkcl::*current-working-directory* */
mkcl_bds_unwind1(env); /* mt::*thread* */
#endif
}
mkcl_object
mkcl_top_apply(MKCL, mkcl_object function, mkcl_object args)
{
static mkcl_object top_apply_fun = mk_cl_Cnil;
mkcl_object value;
if (mkcl_Null(top_apply_fun))
{
top_apply_fun = MKCL_SYM_FUN(@'si::top-apply');
if (mkcl_Null(top_apply_fun))
value = mk_cl_apply(env, 2, function, args);
else
value = mkcl_funcall2(env, top_apply_fun, function, args);
}
else
value = mkcl_funcall2(env, top_apply_fun, function, args);
return value;
}
static thread_value_t CALL_CONV thread_entry_point(void *arg)
{
char stack_mark = 0;
mkcl_object thread = (mkcl_object)arg;
const mkcl_env env = thread->thread.env;
thread_value_t status = (thread_value_t) MKCL_THREAD_NORMAL_EXIT;
if (env->own_thread != thread) return (thread_value_t) MKCL_THREAD_ABORTED;
#ifndef MKCL_WINDOWS
pthread_mutex_lock(thread->thread.running_lock);
/* Insert some private os-level thread initialization here */
pthread_mutex_unlock(thread->thread.running_lock);
pthread_mutex_destroy(thread->thread.running_lock);
thread->thread.running_lock = NULL;
#endif
/* The CATCH_ALL point provides us with an elegant way to
* exit the thread: we just do an unwind to frs_org.
*/
MKCL_CATCH_ALL_BEGIN(env) {
mkcl_object value;
MKCL_SETUP_CALL_STACK_ROOT_GUARD(env);
/* 1) Setup the environment for the execution of the thread */
mkcl_setup_thread_lisp_context(env, &stack_mark);
mkcl_register_thread_as_active(env, thread);
mkcl_enable_interrupts(env);
/* 2) Execute the code. */
value = mkcl_top_apply(env, thread->thread.function, thread->thread.args);
mkcl_cleanup_thread_lisp_context(env);
if (thread->thread.result_value == MKCL_OBJNULL)
thread->thread.result_value = value;
status = (thread_value_t) MKCL_THREAD_NORMAL_EXIT;
#if 0
} MKCL_CATCH_ALL_IF_CAUGHT {
/* mkcl_bds_unwind1(env); */
/* mkcl_bds_unwind1(env); */
/* mkcl_bds_unwind1(env); */
/* mkcl_bds_unwind1(env); */
#endif
} MKCL_CATCH_ALL_END;
status = (thread_value_t) mkcl_exit_status(env);
thread->thread.status = mkcl_thread_done;
/* 3) Exit the thread through this point. */
thread_final_cleanup(env, thread);
return status;
}
#ifdef __linux
static void * signal_servicing_thread_entry_point(void *arg)
{
char stack_mark = 0;
mkcl_object thread = MKCL_CAR((mkcl_object) arg);
const mkcl_env env = thread->thread.env;
int sig = mkcl_fixnum_to_word(MKCL_CDR((mkcl_object) arg));
if (env->own_thread != thread) return (void *) MKCL_THREAD_ABORTED;
pthread_mutex_lock(thread->thread.running_lock);
/* Insert some private thread initialization here */
pthread_mutex_unlock(thread->thread.running_lock);
pthread_mutex_destroy(thread->thread.running_lock);
thread->thread.running_lock = NULL;
/* The CATCH_ALL point provides us with an elegant way
* to exit the thread: we just do an unwind to frs_org.
*/
MKCL_CATCH_ALL_BEGIN(env) {
MKCL_SETUP_CALL_STACK_ROOT_GUARD(env);
/* 1) Setup the environment for the execution of the thread */
#if 1
mkcl_setup_thread_lisp_context(env, &stack_mark);
#else
mkcl_set_thread_env(env);
thread->thread.tid = mkcl_gettid();
mkcl_init_call_stack_overflow_area(env, &stack_mark);
mk_si_clear_all_fpe(env);
mk_si_enable_fpe(env, @':default');
if (!mkcl_Null(thread->thread.initial_bindings))
setup_thread_bindings(env, thread->thread.initial_bindings);
mkcl_bds_bind(env, @'mt::*thread*', thread);
mkcl_bds_bind(env, @'mkcl::*current-working-directory*', mk_cl_Cnil);
mkcl_bds_bind(env, @'mkcl::*all-current-working-directories*', mk_cl_Cnil);
mkcl_bds_bind(env, @'si::*dynamic-cons-stack*', mk_cl_Cnil);
mk_si_trim_dynamic_cons_stack(env);
#endif
mkcl_register_thread_as_active(env, thread);
mkcl_enable_interrupts(env);
/* 2) Execute the code. */
for (;;)
{
int rc = 0;
int received_signo;
do {
MKCL_LIBC_Zzz(env, @':io', rc = sem_wait(mkcl_signals[sig].sem)); /* a sleeping point */
} while ( rc && errno == EINTR );
if ( rc ) mkcl_C_lose(env, "signal_servicing_thread_entry_point failed on sem_wait");
mk_mt_test_for_thread_shutdown(env);
received_signo = ((sig == 0) ? mkcl_terminal_signal_number : sig);
mkcl_top_apply(env, thread->thread.function, MKCL_CONS(env, MKCL_MAKE_FIXNUM(received_signo), mk_cl_Cnil));
}
mkcl_cleanup_thread_lisp_context(env);
#if 0
} MKCL_CATCH_ALL_IF_CAUGHT {
/* mkcl_bds_unwind1(env); */
/* mkcl_bds_unwind1(env); */
/* mkcl_bds_unwind1(env); */
/* mkcl_bds_unwind1(env); */
/* We could add some special action here to help stack unwinding
but we don't need to do anything yet. */
#endif
} MKCL_CATCH_ALL_END;
thread->thread.status = mkcl_thread_done;
thread_final_cleanup(env, thread);
return NULL;
}
#endif /* __linux */
#ifdef __linux
static pthread_mutex_t mkcl_interrupt_thread_lock;
static sigset_t mkcl_standard_sigmask;
#elif defined(MKCL_WINDOWS)
static HANDLE mkcl_interrupt_thread_lock;
#endif
#ifdef __linux
static sem_t mkcl_run_interrupt_function_sem_obj;
static sem_t * mkcl_run_interrupt_function = &mkcl_run_interrupt_function_sem_obj;
static void *
interrupt_thread_entry_point(void *arg)
{
char stack_mark = 0;
int rc = 0;
mkcl_object thread = (mkcl_object)arg;
const mkcl_env env = thread->thread.env;
if (env->own_thread != thread) return (void *) MKCL_THREAD_ABORTED;
pthread_sigmask(SIG_SETMASK, &mkcl_standard_sigmask, NULL);
#if 1
{
struct timespec timeout;
rc = clock_gettime(CLOCK_REALTIME, &timeout);
if (rc)
mkcl_FElibc_error(env, "interrupt_thread_entry_point() failed on clock_gettime", 0);
timeout.tv_nsec += 5 * 1000000; /* 5ms */
if (timeout.tv_nsec >= 1000000000) {
timeout.tv_nsec -= 1000000000;
timeout.tv_sec++;
}
do {
rc = sem_timedwait(mkcl_run_interrupt_function, &timeout);
} while ( rc && errno == EINTR );
if ( rc )
if ( errno == ETIMEDOUT )
{ fputs("\n;; MKCL internal error: interrupt synchronization timedout!\n", stderr); }
else mkcl_C_lose(env, "mk_mt_interrupt_thread failed on sem_timedwait");
}
#else
do {
rc = sem_wait(mkcl_run_interrupt_function);
} while ( rc && errno == EINTR );
if ( rc ) mkcl_C_lose(env, "interrupt_thread_entry_point failed on sem_wait");
#endif
/* The CATCH_ALL point provides us with an elegant way to
* exit the thread: we just do an unwind to frs_org.
*/
MKCL_CATCH_ALL_BEGIN(env) {
/* 1) Setup the environment for the execution of the thread */
mkcl_set_thread_env(env);
mkcl_init_call_stack_overflow_area(env, &stack_mark);
mk_si_clear_all_fpe(env);
mkcl_reactivate_fpe_set(env);
mkcl_enable_interrupts(env);
/* 2) Execute the code. */
mkcl_funcall0(env, thread->thread.interrupt);
mkcl_disable_interrupts(env);
env->nlj_fr = NULL; /* make sure to signal a normal exit */
#if 0
} MKCL_CATCH_ALL_IF_CAUGHT {
/* We could add some special action here to help stack unwinding
but we don't need to do anything yet. */
#endif
} MKCL_CATCH_ALL_END;
if (pthread_mutex_lock(&mkcl_interrupt_thread_lock))
mkcl_lose(env, "interrupt_thread_entry_point failed on pthread_mutex_lock");
{
int rc = 0;
int sig = mkcl_get_option(MKCL_OPT_THREAD_RESUME_SIGNAL);
int count = thread->thread.interrupt_count - 1;
struct interrupted_thread_ctrl * p = &(thread->thread.interrupted_threads[count]);
thread->thread.thread = p->thread_ident;
env->cs_org = p->cs_org;
env->cs_limit = p->cs_limit;
env->cs_size = p->cs_size;
env->cs_overflow_size = p->cs_overflow_size;
env->cs_overflowing = p->cs_overflowing;
if ( env->nlj_fr == NULL )
{ /* This is a normal (not unwinding) return. */
env->disable_interrupts = p->disable_interrupts;
#if MKCL_DEBUG_INTERRUPT_MASK
env->interrupt_disabler_file = p->interrupt_disabler_file;
env->interrupt_disabler_lineno = p->interrupt_disabler_lineno;
#endif
}
/* Restore interrupted thread values. */
env->nvalues = p->nvalues;
{
int j;
const int max = p->nvalues;
mkcl_object * const values = p->values;
mkcl_object * const env_values = env->values;
for (j = 0; j < max; j++) env_values[j] = values[j];
}
thread->thread.interrupt_count = count; /* interrupted_threads stack poped */
mkcl_interrupted_thread_env = env;
env->own_thread->thread.resume_handler_ran = FALSE;
/* resume the interrupted thread */
if ((rc = pthread_kill(thread->thread.thread, sig)))
switch (rc)
{
case ESRCH: /* the interrupted thread died on us unexpectedly! */
/* Should we flag this untimely death or simply wimper away? */
/* Let's be quiet for now. */
break;
case EINVAL:
mkcl_lose(env, "interrupt_thread_entry_point: invalid signal used with pthread_kill");
break;
default:
mkcl_lose(env, "interrupt_thread_entry_point failed on pthread_kill");
break;
}
else
{
do {
rc = sem_wait(mkcl_interrupted_thread_resumed);
} while ( rc && errno == EINTR );
if ( rc ) mkcl_C_lose(env, "interrupt_thread_entry_point failed on sem_wait");
}
mkcl_interrupted_thread_env = NULL;
}
if (pthread_mutex_unlock(&mkcl_interrupt_thread_lock))
mkcl_lose(env, "interrupt_thread_entry_point failed on pthread_mutex_unlock");
pthread_detach(pthread_self()); /* no join for interrupt threads. */
return NULL;
}
#elif defined(MKCL_WINDOWS)
static void resume_thread_unwinding(void)
{ /* This function is never called through normal means.
Its call is the result a direct instruction pointer
manipulation through the "CONTEXT" structure.
*/
/* In this function we cannot assume that we have a valid
stack frame to work with, so no automatic variable allowed!
*/
const mkcl_env env = MKCL_ENV();
mkcl_unwind(env, env->nlj_fr);
/* We should never return from the line just above! */
mkcl_lose(env, "resume_thread_unwinding failed!");
}
static thread_value_t CALL_CONV interrupt_thread_entry_point(void * arg)
{
char stack_mark = 0;
mkcl_object thread = (mkcl_object)arg;
const mkcl_env env = thread->thread.env;
if (env->own_thread != thread) return MKCL_THREAD_ABORTED;
/* The CATCH_ALL point is the destination provides us with an elegant way
* to exit the thread: we just do an unwind up to frs_top.
*/
MKCL_CATCH_ALL_BEGIN(env) {
/* 1) Setup the environment for the execution of the thread */
mkcl_set_thread_env(env);
mkcl_init_call_stack_overflow_area(env, &stack_mark);
mk_si_clear_all_fpe(env);
mkcl_reactivate_fpe_set(env);
mkcl_enable_interrupts(env);
/* 2) Execute the code. */
mkcl_funcall0(env, thread->thread.interrupt);
mkcl_disable_interrupts(env);
env->nlj_fr = NULL; /* make sure to signal a normal exit */
#if 0
} MKCL_CATCH_ALL_IF_CAUGHT {
/* We could add some special action here to help stack unwinding
but we don't need to do anything yet. */
#endif
} MKCL_CATCH_ALL_END;
{
DWORD wait_val;
MKCL_LIBC_NO_INTR(env, wait_val = WaitForSingleObject(mkcl_interrupt_thread_lock, INFINITE));
switch (wait_val)
{
case WAIT_OBJECT_0: break;
case WAIT_TIMEOUT:
case WAIT_ABANDONED:
case WAIT_FAILED:
default:
mkcl_FEwin32_error(env, "interrupt-thread failed to acquire lock", 0);
}
}
{
HANDLE os_thread;
HANDLE old_os_thread;
int count = thread->thread.interrupt_count - 1;
struct interrupted_thread_ctrl * p = &(thread->thread.interrupted_threads[count]);
old_os_thread = thread->thread.thread;
if (!CloseHandle(old_os_thread))
mkcl_FEwin32_error(env, "Cannot call CloseHandle to dispose of old interrupt thread for thread ~A", 1, thread);
os_thread = thread->thread.thread = p->thread_ident;
p->thread_ident = NULL;
env->cs_org = p->cs_org;
env->cs_limit = p->cs_limit;
env->cs_size = p->cs_size;
env->cs_overflow_size = p->cs_overflow_size;
env->cs_overflowing = p->cs_overflowing;
if ( env->nlj_fr == NULL )
{ /* This is a normal (not unwinding) return. */
env->disable_interrupts = p->disable_interrupts;
#if MKCL_DEBUG_INTERRUPT_MASK
env->interrupt_disabler_file = p->interrupt_disabler_file;
env->interrupt_disabler_lineno = p->interrupt_disabler_lineno;
#endif
}
/* Restore interrupted thread values. */
env->nvalues = p->nvalues;
{
int j;
const int max = p->nvalues;
mkcl_object * const values = p->values;
mkcl_object * const env_values = env->values;
for (j = 0; j < max; j++) env_values[j] = values[j];
}
thread->thread.interrupt_count = count; /* interrupted_threads stack poped */
env->own_thread->thread.resume_handler_ran = FALSE; /* needed? No. */
if ( env->nlj_fr != NULL )
{
CONTEXT context;
context.ContextFlags = CONTEXT_CONTROL | CONTEXT_INTEGER;
if (!GetThreadContext(os_thread, &context))
mkcl_FEwin32_error(env, "Cannot get context for thread ~A", 1, thread);
#if defined(_X86_)
context.Eip = (DWORD) resume_thread_unwinding;
#elif defined(__x86_64)
context.Rip = (DWORD64) resume_thread_unwinding;
#else
#error Unknown processor architecture
#endif
if (!SetThreadContext(os_thread, &context))
mkcl_FEwin32_error(env, "Cannot set context for thread ~A", 1, thread);
}
{
DWORD count;
if ((count = ResumeThread(os_thread)) == (DWORD)-1)
mkcl_FEwin32_error(env, "Cannot resume interrupted thread ~A", 1, thread);
}
}
if (!ReleaseMutex(mkcl_interrupt_thread_lock))
mkcl_FEwin32_error(env, "interrupt thread failed to release interrupt lock", 0);
return 0;
}
#endif /* defined(MKCL_WINDOWS) */
static void setup_thread_bindings(MKCL, mkcl_object initial_bindings)
{
mkcl_object l = initial_bindings;
mkcl_object table = mk_cl__make_hash_table(env, @'eq',
MKCL_MAKE_FIXNUM(1024),
MKCL_MAKE_FIXNUM(1024),
MKCL_MAKE_FIXNUM(1));
mkcl_loop_for_in(env, l)
{
mkcl_object cell = MKCL_CONS_CAR(l);
mkcl_object sym = MKCL_CONS_CAR(cell);
mkcl_object value = MKCL_CONS_CDR(cell);
mkcl_check_symbol(env, sym);
if (NULL == mkcl_search_hash(env, sym, table))
{
mkcl_sethash(env, sym, table, value);
mkcl_bds_bind(env, sym, value);
}
}
mkcl_end_loop_for_in;
}
static mkcl_object
_mkcl_specials_snapshot(MKCL)
{
struct mkcl_bds_bd * bds_top = env->bds_top;
struct mkcl_bds_bd * bds = env->bds_org;
mkcl_object init_bind = mk_cl_Cnil;
for (; bds <= bds_top; bds++)
init_bind = mk_cl_acons(env, bds->symbol, MKCL_SYM_VAL(env, bds->symbol), init_bind);
return(init_bind);
}
void
_mkcl_dealloc_env(MKCL)
{
int i;
for (i = 0; i < 3; i++)
{
_mkcl_big_clear(env->big_register[i]);
}
mkcl_dealloc(env, env);
}
const mkcl_env _mkcl_alloc_env(MKCL)
{
/* This function is called so early in the life of a MKCL world that we cannot
allow it to throw a CL condition under any circonstance,
or to report any kind of error in any case.
*/
const mkcl_env new_env = _mkcl_alloc_raw_env(env);
if (new_env == NULL) /* alloc failed no point in going any further. */
return(NULL);
/*
* An uninitialized environment _always_ disables interrupts. They
* are activated later on by the thread entry point or mkcl_init_unixint().
*/
mkcl_disable_interrupts(new_env);
new_env->sleeping_on = mk_cl_Cnil;
new_env->cs_org = NULL;
new_env->cs_limit = NULL;
new_env->cs_size = 0;
new_env->cs_overflow_size = 0;
new_env->cs_overflowing = FALSE;
new_env->nvalues = 0;
{
int i;
for (i = 0; i < MKCL_MULTIPLE_VALUES_LIMIT; i++)
new_env->values[i] = mk_cl_Cnil;
}
new_env->function = mk_cl_Cnil;
new_env->temp_stack_size = 0;
new_env->temp_stack_size_limit = 0;
new_env->temp_stack = NULL;
new_env->temp_stack_top = NULL;
new_env->temp_stack_upper_bound = NULL;
new_env->temp_stack_overflow_size = 0;
new_env->temp_stack_overflowing = FALSE;
new_env->bds_size = 0;
new_env->bds_size_limit = 0;
new_env->bds_org = NULL;
new_env->bds_top = NULL;
new_env->bds_upper_bound = NULL;
new_env->bds_overflow_size = 0;
new_env->bds_overflowing = FALSE;
new_env->specials_size = MKCL_STARTUP_SPECIALS_SIZE;
new_env->specials = ((env == NULL)
? _mkcl_boot_alloc_unprotected(MKCL_STARTUP_SPECIALS_SIZE * sizeof(mkcl_object))
: mkcl_alloc(env, MKCL_STARTUP_SPECIALS_SIZE * sizeof(mkcl_object)));
if (new_env->specials)
{
mkcl_index i;
for (i = 0; i < MKCL_STARTUP_SPECIALS_SIZE; i++)
new_env->specials[i] = MKCL_END_OF_BDS_CHAIN;
}
else
return(NULL);
new_env->ihs_top = NULL;
new_env->frs_size = 0;
new_env->frs_size_limit = 0;
new_env->frs_org = NULL;
new_env->frs_top = NULL;
new_env->frs_upper_bound = NULL;
new_env->nlj_fr = NULL;
new_env->go_label_index = -1; /* Normally this should be an invalid index. */
new_env->frs_overflow_size = 0;
new_env->frs_overflowing = FALSE;
new_env->string_pool = mk_cl_Cnil;
new_env->c_env = NULL;
new_env->fmt_aux_stream = mk_cl_Cnil;
new_env->print_pretty = FALSE;
new_env->queue = NULL;
new_env->indent_stack = NULL;
new_env->qh = new_env->qt = new_env->qc = new_env->isp = new_env->iisp = 0;
new_env->big_register[0] = mk_cl_Cnil;
new_env->big_register[1] = mk_cl_Cnil;
new_env->big_register[2] = mk_cl_Cnil;
new_env->own_thread = mk_cl_Cnil;
new_env->method_hash_clear_list = mk_cl_Cnil;
new_env->method_hash = mk_cl_Cnil;
new_env->method_spec_vector = mk_cl_Cnil;
new_env->method_generation = 0;
new_env->fficall = NULL;
new_env->altstack = NULL;
new_env->altstack_size = 0;
new_env->fpe_control_bits = 0;
new_env->interrupt_disabler_file = NULL;
new_env->interrupt_disabler_lineno = 0;
new_env->fp_drone = 0;
/* new_env->alloc = NULL; _mkcl_alloc_raw_env() takes care of this one. */
new_env->cs_org_request = NULL;
new_env->cs_size_request = 0;
return new_env;
}
void
mkcl_init_env(MKCL, mkcl_env new_env, struct mkcl_thread_init_parameters * params)
{
new_env->c_env = NULL;
new_env->string_pool = mk_cl_Cnil;
new_env->method_hash = mk_cl_Cnil;
new_env->method_spec_vector = mk_cl_Cnil;
new_env->method_generation = 0;
_mkcl_set_method_hash_size(new_env, 4096);
new_env->method_hash_clear_list = mk_cl_Cnil;
mkcl_init_stacks(env, new_env, params);
{
int i;
for (i = 0; i < 3; i++)
{
mkcl_object x = mkcl_alloc_raw_bignum(env);
_mkcl_big_init2(x, MKCL_BIG_REGISTER_SIZE);
new_env->big_register[i] = x;
}
}
new_env->fpe_control_bits = 0;
}
mkcl_object
mkcl_make_thread(MKCL, mkcl_object name, mkcl_object initial_bindings, struct mkcl_thread_init_parameters * params)
{
const mkcl_env new_env = _mkcl_alloc_env(env);
mkcl_object thread = mkcl_alloc_raw_thread(env);
thread->thread.status = mkcl_thread_initialized;
thread->thread.name = name;
thread->thread.function = mk_cl_Cnil;
thread->thread.args = mk_cl_Cnil;
thread->thread.result_value = MKCL_OBJNULL;
thread->thread.detached = FALSE;
thread->thread.thread = 0;
thread->thread.base_thread = 0;
thread->thread.tid = 0;
thread->thread.interrupt = mk_cl_Cnil;
thread->thread.plist = mk_cl_Cnil;
thread->thread.shutdown_requested = false;
thread->thread.env = new_env;
#if __unix
thread->thread.running_lock = NULL;
sigemptyset(&thread->thread.saved_sigmask);
#endif
thread->thread.resume_handler_ran = FALSE;
thread->thread.sigmask_frs_marker = NULL;
thread->thread.interrupt_count = 0;
{
int i, j;
for (i = 0; i < MKCL_MAX_INTERRUPTS; i++)
{
thread->thread.interrupted_threads[i].thread_ident = 0;
thread->thread.interrupted_threads[i].cs_org = NULL;
thread->thread.interrupted_threads[i].cs_limit = NULL;
thread->thread.interrupted_threads[i].cs_size = 0;
thread->thread.interrupted_threads[i].cs_overflow_size = 0;
thread->thread.interrupted_threads[i].cs_overflowing = FALSE;
thread->thread.interrupted_threads[i].disable_interrupts = FALSE;
thread->thread.interrupted_threads[i].interrupt_disabler_file = NULL;
thread->thread.interrupted_threads[i].interrupt_disabler_lineno = 0;
thread->thread.interrupted_threads[i].nvalues = 0;
mkcl_object * values = thread->thread.interrupted_threads[i].values;
for (j = 0; j < MKCL_MULTIPLE_VALUES_LIMIT; j++) values[j] = mk_cl_Cnil;
}
}
thread->thread.initial_bindings = NULL;
if (initial_bindings == mk_cl_Ct)
{ /* New thread inherits its initial bindings from its creator thread. */
thread->thread.initial_bindings = _mkcl_specials_snapshot(env);
}
else
thread->thread.initial_bindings = mk_cl_copy_alist(env, initial_bindings);
new_env->own_thread = thread;
mkcl_init_env(env, new_env, params);
mk_si_set_finalizer(env, thread, mk_cl_Ct);
return thread;
}
#ifdef MKCL_WINDOWS
static CRITICAL_SECTION mkcl_imported_thread_pool_lock;
static HANDLE mkcl_imported_thread_pool_empty; /* Semaphore */
static HANDLE mkcl_imported_thread_pool_full; /* Semaphore */
#else
static pthread_mutex_t mkcl_imported_thread_pool_lock;
static sem_t mkcl_imported_thread_pool_empty_sem_obj;
static sem_t * mkcl_imported_thread_pool_empty = &mkcl_imported_thread_pool_empty_sem_obj;
static sem_t mkcl_imported_thread_pool_full_sem_obj;
static sem_t * mkcl_imported_thread_pool_full = &mkcl_imported_thread_pool_full_sem_obj;
#endif
static void fill_imported_thread_pool(MKCL)
{
volatile bool locked = false;
mkcl_object head;
int i;
MKCL_UNWIND_PROTECT_BEGIN(env) {
mkcl_interrupt_status old_intr;
struct mkcl_thread_init_parameters init_params = { 0 };
mkcl_get_interrupt_status(env, &old_intr);
mkcl_disable_interrupts(env);
#ifdef MKCL_WINDOWS
EnterCriticalSection(&mkcl_imported_thread_pool_lock);
#else
if (pthread_mutex_lock(&mkcl_imported_thread_pool_lock))
mkcl_lose(env, "fill_imported_thread_pool failed on pthread_mutex_lock");
#endif
locked = true;
mkcl_set_interrupt_status(env, &old_intr);
head = mkcl_core.imported_thread_pool;
for (i = 0; i < 5; i++)
head = MKCL_CONS(env, mkcl_make_thread(env, mk_cl_Cnil, mk_cl_Cnil, &init_params), head);
mkcl_core.imported_thread_pool = head;
} MKCL_UNWIND_PROTECT_EXIT {
#ifdef MKCL_WINDOWS
if (locked)