blob: 443ef1264c74e38f4755a303a03e7ef408984294 (
plain) (
blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
|
/*
* %CopyrightBegin%
*
* Copyright Ericsson AB 2006-2017. All Rights Reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* %CopyrightEnd%
*/
/**
* @description Check I/O, a cross platform IO polling framework for ERTS
*
* @author Rickard Green
* @author Lukas Larsson
*/
#ifndef ERL_CHECK_IO_H__
#define ERL_CHECK_IO_H__
#include "sys.h"
#include "erl_sys_driver.h"
/** @brief a structure that is used by each polling thread */
struct erts_poll_thread;
/**
* Get the memory size of the check io framework
*/
Uint erts_check_io_size(void);
/**
* Returns an Eterm with information about all the pollsets active at the
* moment.
*
* @param proc the Process* to allocate the result on. It is passed as
* void * because of header include problems.
*/
Eterm erts_check_io_info(void *proc);
/**
* Should be called when a port IO task has been executed in order to re-enable
* or clear the information about the fd.
*
* @param type The type of event that has been completed.
* @param handle The port task handle of the event.
* @param reset A function pointer to be called when the port task handle
* should be reset.
*/
void erts_io_notify_port_task_executed(ErtsPortTaskType type,
ErtsPortTaskHandle *handle,
void (*reset)(ErtsPortTaskHandle *));
/**
* Returns the maximum number of fds that the check io framework can handle.
*/
int erts_check_io_max_files(void);
/**
* Called by any thread that should check for new IO events. This function will
* not return unless erts_check_io_interrupt(pt, 1) is called by another thread.
*
* @param pt the poll thread structure to use.
*/
void erts_check_io(struct erts_poll_thread *pt);
/**
* Initialize the check io framework. This function will parse the arguments
* and delete any entries that it is interested in.
*
* @param argc the number of arguments
* @param argv an array with the arguments
*/
void erts_init_check_io(int *argc, char **argv);
/**
* Interrupt the poll thread so that it can execute other code.
*
* Should be called with set = 0 by the waiting thread before calling
* erts_check_io.
*
* @param pt the poll thread to wake
* @param set whether to set or clear the interrupt flag
*/
void erts_check_io_interrupt(struct erts_poll_thread *pt, int set);
/**
* Create a new poll thread structure that is associated with the number no.
* It is the callers responsibility that no is unique.
*/
struct erts_poll_thread* erts_create_pollset_thread(int no);
#ifdef ERTS_ENABLE_LOCK_COUNT
/**
* Toggle lock counting on all check io locks
*/
void erts_lcnt_update_cio_locks(int enable);
#endif
typedef struct {
ErtsPortTaskHandle task;
ErtsSysFdType fd;
} ErtsIoTask;
#endif /* ERL_CHECK_IO_H__ */
#if !defined(ERL_CHECK_IO_C__) && !defined(ERTS_ALLOC_C__)
#define ERL_CHECK_IO_INTERNAL__
#endif
#define ERTS_CHECK_IO_DRV_EV_STATE_LOCK_CNT 128
/* Controls how many pollsets to allocate. Fd's are hashed into
each pollset based on the FD. When doing non-concurrent updates
there will be one pollset per thread.
*/
extern int erts_no_pollsets;
extern int erts_no_poll_threads;
#ifndef ERL_CHECK_IO_INTERNAL__
#define ERL_CHECK_IO_INTERNAL__
#include "erl_poll.h"
#include "erl_port_task.h"
#ifdef __WIN32__
/*
* Current erts_poll implementation for Windows cannot handle
* active events in the set of events polled.
*/
# define ERTS_CIO_DEFER_ACTIVE_EVENTS 1
#else
# define ERTS_CIO_DEFER_ACTIVE_EVENTS 1
#endif
typedef struct {
Eterm inport;
Eterm outport;
ErtsIoTask iniotask;
ErtsIoTask outiotask;
} ErtsDrvSelectDataState;
struct erts_nif_select_event {
Eterm pid;
Eterm immed;
Uint32 refn[ERTS_REF_NUMBERS];
Sint32 ddeselect_cnt; /* 0: No delayed deselect in progress
* 1: Do deselect before next poll
* >1: Countdown of ignored events
*/
};
typedef struct {
struct erts_nif_select_event in;
struct erts_nif_select_event out;
} ErtsNifSelectDataState;
#endif /* #ifndef ERL_CHECK_IO_INTERNAL__ */
|
