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/**********************************************************************
thread_pthread.h -
$Author$
Copyright (C) 2004-2007 Koichi Sasada
**********************************************************************/
#ifndef RUBY_THREAD_PTHREAD_H
#define RUBY_THREAD_PTHREAD_H
#ifdef HAVE_PTHREAD_NP_H
#include <pthread_np.h>
#endif
#define RB_NATIVETHREAD_LOCK_INIT PTHREAD_MUTEX_INITIALIZER
#define RB_NATIVETHREAD_COND_INIT PTHREAD_COND_INITIALIZER
typedef pthread_cond_t rb_nativethread_cond_t;
typedef struct native_thread_data_struct {
union {
struct list_node ubf;
struct list_node gvl;
} node;
#if defined(__GLIBC__) || defined(__FreeBSD__)
union
#else
/*
* assume the platform condvars are badly implemented and have a
* "memory" of which mutex they're associated with
*/
struct
#endif
{
rb_nativethread_cond_t intr; /* th->interrupt_lock */
rb_nativethread_cond_t gvlq; /* vm->gvl.lock */
} cond;
} native_thread_data_t;
#undef except
#undef try
#undef leave
#undef finally
typedef struct rb_global_vm_lock_struct {
/* fast path */
const struct rb_thread_struct *owner;
rb_nativethread_lock_t lock; /* AKA vm->gvl.lock */
/*
* slow path, protected by vm->gvl.lock
* - @waitq - FIFO queue of threads waiting for GVL
* - @timer - it handles timeslices for @owner. It is any one thread
* in @waitq, there is no @timer if @waitq is empty, but always
* a @timer if @waitq has entries
* - @timer_err tracks timeslice limit, the timeslice only resets
* when pthread_cond_timedwait returns ETIMEDOUT, so frequent
* switching between contended/uncontended GVL won't reset the
* timer.
*/
struct list_head waitq; /* <=> native_thread_data_t.node.ubf */
const struct rb_thread_struct *timer;
int timer_err;
/* yield */
rb_nativethread_cond_t switch_cond;
rb_nativethread_cond_t switch_wait_cond;
int need_yield;
int wait_yield;
} rb_global_vm_lock_t;
#endif /* RUBY_THREAD_PTHREAD_H */
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