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/*
+----------------------------------------------------------------------+
| Zend Engine |
+----------------------------------------------------------------------+
| Copyright (c) Zend Technologies Ltd. (http://www.zend.com) |
+----------------------------------------------------------------------+
| This source file is subject to version 2.00 of the Zend license, |
| that is bundled with this package in the file LICENSE, and is |
| available through the world-wide-web at the following url: |
| http://www.zend.com/license/2_00.txt. |
| If you did not receive a copy of the Zend license and are unable to |
| obtain it through the world-wide-web, please send a note to |
| license@zend.com so we can mail you a copy immediately. |
+----------------------------------------------------------------------+
| Authors: Aaron Piotrowski <aaron@trowski.com> |
| Martin Schröder <m.schroeder2007@gmail.com> |
+----------------------------------------------------------------------+
*/
#ifndef ZEND_FIBERS_H
#define ZEND_FIBERS_H
#include "zend_API.h"
#include "zend_types.h"
#define ZEND_FIBER_GUARD_PAGES 1
#define ZEND_FIBER_DEFAULT_C_STACK_SIZE (4096 * (((sizeof(void *)) < 8) ? 256 : 512))
#define ZEND_FIBER_VM_STACK_SIZE (1024 * sizeof(zval))
BEGIN_EXTERN_C()
typedef enum {
ZEND_FIBER_STATUS_INIT,
ZEND_FIBER_STATUS_RUNNING,
ZEND_FIBER_STATUS_SUSPENDED,
ZEND_FIBER_STATUS_DEAD,
} zend_fiber_status;
typedef enum {
ZEND_FIBER_FLAG_THREW = 1 << 0,
ZEND_FIBER_FLAG_BAILOUT = 1 << 1,
ZEND_FIBER_FLAG_DESTROYED = 1 << 2,
} zend_fiber_flag;
typedef enum {
ZEND_FIBER_TRANSFER_FLAG_ERROR = 1 << 0,
ZEND_FIBER_TRANSFER_FLAG_BAILOUT = 1 << 1
} zend_fiber_transfer_flag;
void zend_register_fiber_ce(void);
void zend_fiber_init(void);
void zend_fiber_shutdown(void);
extern ZEND_API zend_class_entry *zend_ce_fiber;
typedef struct _zend_fiber_stack zend_fiber_stack;
/* Encapsulates data needed for a context switch. */
typedef struct _zend_fiber_transfer {
/* Fiber that will be switched to / has resumed us. */
zend_fiber_context *context;
/* Value to that should be send to (or was received from) a fiber. */
zval value;
/* Bitmask of flags defined in enum zend_fiber_transfer_flag. */
uint8_t flags;
} zend_fiber_transfer;
/* Coroutine functions must populate the given transfer with a new context
* and (optional) data before they return. */
typedef void (*zend_fiber_coroutine)(zend_fiber_transfer *transfer);
typedef void (*zend_fiber_clean)(zend_fiber_context *context);
struct _zend_fiber_context {
/* Pointer to boost.context or ucontext_t data. */
void *handle;
/* Pointer that identifies the fiber type. */
void *kind;
/* Entrypoint function of the fiber. */
zend_fiber_coroutine function;
/* Cleanup function for fiber. */
zend_fiber_clean cleanup;
/* Assigned C stack. */
zend_fiber_stack *stack;
/* Fiber status. */
zend_fiber_status status;
/* Observer state */
zend_execute_data *top_observed_frame;
/* Reserved for extensions */
void *reserved[ZEND_MAX_RESERVED_RESOURCES];
};
struct _zend_fiber {
/* PHP object handle. */
zend_object std;
/* Flags are defined in enum zend_fiber_flag. */
uint8_t flags;
/* Native C fiber context. */
zend_fiber_context context;
/* Fiber that resumed us. */
zend_fiber_context *caller;
/* Fiber that suspended us. */
zend_fiber_context *previous;
/* Callback and info / cache to be used when fiber is started. */
zend_fcall_info fci;
zend_fcall_info_cache fci_cache;
/* Current Zend VM execute data being run by the fiber. */
zend_execute_data *execute_data;
/* Frame on the bottom of the fiber vm stack. */
zend_execute_data *stack_bottom;
/* Active fiber vm stack. */
zend_vm_stack vm_stack;
/* Storage for fiber return value. */
zval result;
};
ZEND_API zend_result zend_fiber_start(zend_fiber *fiber, zval *return_value);
ZEND_API void zend_fiber_resume(zend_fiber *fiber, zval *value, zval *return_value);
ZEND_API void zend_fiber_suspend(zend_fiber *fiber, zval *value, zval *return_value);
/* These functions may be used to create custom fiber objects using the bundled fiber switching context. */
ZEND_API zend_result zend_fiber_init_context(zend_fiber_context *context, void *kind, zend_fiber_coroutine coroutine, size_t stack_size);
ZEND_API void zend_fiber_destroy_context(zend_fiber_context *context);
ZEND_API void zend_fiber_switch_context(zend_fiber_transfer *transfer);
#ifdef ZEND_CHECK_STACK_LIMIT
ZEND_API void* zend_fiber_stack_limit(zend_fiber_stack *stack);
ZEND_API void* zend_fiber_stack_base(zend_fiber_stack *stack);
#endif /* ZEND_CHECK_STACK_LIMIT */
ZEND_API void zend_fiber_switch_block(void);
ZEND_API void zend_fiber_switch_unblock(void);
ZEND_API bool zend_fiber_switch_blocked(void);
END_EXTERN_C()
static zend_always_inline zend_fiber *zend_fiber_from_context(zend_fiber_context *context)
{
ZEND_ASSERT(context->kind == zend_ce_fiber && "Fiber context does not belong to a Zend fiber");
return (zend_fiber *)(((char *) context) - XtOffsetOf(zend_fiber, context));
}
static zend_always_inline zend_fiber_context *zend_fiber_get_context(zend_fiber *fiber)
{
return &fiber->context;
}
#endif
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