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/* Copyright ©2007-2010 Kris Maglione <maglione.k at Gmail>
* See LICENSE file for license details.
*/
#include <errno.h>
#include <stdlib.h>
#include <unistd.h>
#include <ruby.h>
#include "ixp_local.h"
static IxpThread ixp_rthread;
static char RWLock[];
/**
* Function: ixp_rubyinit
*
* This function initializes libixp for use in multithreaded
* programs embedded in the ruby interpreter. When using a pthread
* edition of ruby, ixp_pthread_init should be used instead. When
* using libixp in such programs, this function must be called
* before any other libixp functions.
*
* This function is part of libixp_rubythread, which is part of the
* libixp distribution, but is not built by default unless enabled
* in config.mk.
*/
int
ixp_rubyinit(void) {
rb_require("thread.rb");
rb_eval_string(RWLock);
ixp_thread = &ixp_rthread;
return 0;
}
static char*
errbuf(void) {
static ID key;
volatile VALUE val;
if(key == 0L)
key = rb_intern("_ixp_errbuf");
val = rb_thread_local_aref(rb_thread_current(), key);
if(NIL_P(val)) {
val = rb_str_new(nil, IXP_ERRMAX);
rb_thread_local_aset(rb_thread_current(), key, val);
}
Check_Type(val, T_STRING);
return RSTRING(val)->ptr;
}
static void
save(char *eval, void **place) {
*place = (void*)rb_eval_string(eval);
rb_gc_register_address((VALUE*)place);
}
static void
unsave(void **place) {
rb_gc_unregister_address((VALUE*)place);
}
#define call(obj, meth, ...) rb_funcall((VALUE)obj, rb_intern(meth), __VA_ARGS__)
/* Mutex */
static int
initmutex(IxpMutex *m) {
save("Mutex.new", &m->aux);
return 0;
}
static void
mdestroy(IxpMutex *m) {
unsave(&m->aux);
}
static void
mlock(IxpMutex *m) {
call(m->aux, "lock", 0);
}
static int
mcanlock(IxpMutex *m) {
return call(m->aux, "trylock", 0);
}
static void
munlock(IxpMutex *m) {
call(m->aux, "unlock", 0);
}
/* RWLock */
static int
initrwlock(IxpRWLock *rw) {
save("RWLock.new", &rw->aux);
return 0;
}
static void
rwdestroy(IxpRWLock *rw) {
unsave(&rw->aux);
}
static void
rlock(IxpRWLock *rw) {
call(rw->aux, "rdlock", 0);
}
static int
canrlock(IxpRWLock *rw) {
return call(rw->aux, "tryrdlock", 0) == Qtrue;
}
static void
wlock(IxpRWLock *rw) {
call(rw->aux, "wrlock", 0);
}
static int
canwlock(IxpRWLock *rw) {
return call(rw->aux, "trywrlock", 0) == Qtrue;
}
static void
rwunlock(IxpRWLock *rw) {
call(rw->aux, "unlock", 0);
}
/* Rendez */
static int
initrendez(IxpRendez *r) {
save("ConditionVariable.new", &r->aux);
return 0;
}
static void
rdestroy(IxpRendez *r) {
unsave(&r->aux);
}
static void
rsleep(IxpRendez *r) {
call(r->aux, "wait", 1, (VALUE)r->mutex->aux);
}
static int
rwake(IxpRendez *r) {
call(r->aux, "signal", 0);
return 0;
}
static int
rwakeall(IxpRendez *r) {
call(r->aux, "broadcast", 0);
return 0;
}
/* Yielding IO */
static ssize_t
_read(int fd, void *buf, size_t size) {
int n;
rb_thread_wait_fd(fd);
n = read(fd, buf, size);
if(n < 0 && errno == EINTR)
rb_thread_schedule();
return n;
}
static ssize_t
_write(int fd, const void *buf, size_t size) {
int n;
rb_thread_fd_writable(fd);
n = write(fd, buf, size);
if(n < 0 && errno == EINTR)
rb_thread_schedule();
return n;
}
static IxpThread ixp_rthread = {
/* Mutex */
.initmutex = initmutex,
.lock = mlock,
.canlock = mcanlock,
.unlock = munlock,
.mdestroy = mdestroy,
/* RWLock */
.initrwlock = initrwlock,
.rlock = rlock,
.canrlock = canrlock,
.wlock = wlock,
.canwlock = canwlock,
.runlock = rwunlock,
.wunlock = rwunlock,
.rwdestroy = rwdestroy,
/* Rendez */
.initrendez = initrendez,
.sleep = rsleep,
.wake = rwake,
.wakeall = rwakeall,
.rdestroy = rdestroy,
/* Other */
.errbuf = errbuf,
.read = _read,
.write = _write,
.select = rb_thread_select,
};
static char RWLock[] =
"class RWLock \n"
" def initialize \n"
" @rdqueue = [] \n"
" @wrqueue = [] \n"
" @wrheld = nil \n"
" @rdheld = [] \n"
" end \n"
" \n"
" def rdlock \n"
" cr = Thread.critical \n"
" while (Thread.critical = true; @wrheld != nil && @rwheld != Thread.current)\n"
" @rdqueue.push Thread.current \n"
" Thread.stop \n"
" end \n"
" @wrheld = nil \n"
" @rdheld.push Thread.current \n"
" \n"
" @rdqueue.each {|t| t.wakeup} \n"
" Thread.critical = cr \n"
" self \n"
" end \n"
" \n"
" def wrlock \n"
" cr = Thread.critical \n"
" while (Thread.critical = true; \n"
" !@rdheld.empty? || (@wrheld != Thread.current && @wrheld != nil)) \n"
" @wrqueue.push Thread.current \n"
" Thread.stop \n"
" end \n"
" @wrheld = Thread.current \n"
" Thread.critical = cr \n"
" self \n"
" end \n"
" \n"
" \n"
" def tryrdlock \n"
" cr = Thread.critical \n"
" if @wrheld == nil \n"
" rdlock \n"
" true \n"
" else \n"
" false \n"
" end \n"
" ensure \n"
" Thread.critical = cr \n"
" end \n"
" \n"
" def trywrlock \n"
" cr = Thread.critical \n"
" if @wrheld == nil && @rdheld.empty? \n"
" wrlock \n"
" true \n"
" else \n"
" false \n"
" end \n"
" ensure \n"
" Thread.critical = cr \n"
" end \n"
" \n"
" def unlock \n"
" cr = Thread.critical \n"
" Thread.critical = true \n"
" \n"
" if @rdheld.include?(Thread.current) \n"
" @rdheld.remove!(Thread.current) \n"
" raise if @wrheld \n"
" elsif @rwheld != Thread.current \n"
" raise \n"
" end \n"
" \n"
" @wrheld = nil \n"
" if !@rwqueue.empty? && @rdheld.empty? \n"
" @wrheld = @wrqueue.shift \n"
" elsif !@rdqueue.empty \n"
" @wrheld = @rdqueue.shift \n"
" end \n"
" @wrheld.wakeup if @wrheld \n"
" ensure \n"
" Thread.critical = cr \n"
" end \n"
"end \n";
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