Annotation of embedaddon/quagga/lib/thread.h, revision 1.1.1.3
1.1 misho 1: /* Thread management routine header.
2: * Copyright (C) 1998 Kunihiro Ishiguro
1.1.1.2 misho 3: * Portions Copyright (c) 2008 Everton da Silva Marques <everton.marques@gmail.com>
1.1 misho 4: *
5: * This file is part of GNU Zebra.
6: *
7: * GNU Zebra is free software; you can redistribute it and/or modify it
8: * under the terms of the GNU General Public License as published by the
9: * Free Software Foundation; either version 2, or (at your option) any
10: * later version.
11: *
12: * GNU Zebra is distributed in the hope that it will be useful, but
13: * WITHOUT ANY WARRANTY; without even the implied warranty of
14: * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15: * General Public License for more details.
16: *
17: * You should have received a copy of the GNU General Public License
18: * along with GNU Zebra; see the file COPYING. If not, write to the Free
19: * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
20: * 02111-1307, USA.
21: */
22:
23: #ifndef _ZEBRA_THREAD_H
24: #define _ZEBRA_THREAD_H
25:
1.1.1.2 misho 26: #include <zebra.h>
27:
1.1 misho 28: struct rusage_t
29: {
30: #ifdef HAVE_RUSAGE
31: struct rusage cpu;
32: #endif
33: struct timeval real;
34: };
35: #define RUSAGE_T struct rusage_t
36:
37: #define GETRUSAGE(X) thread_getrusage(X)
38:
39: /* Linked list of thread. */
40: struct thread_list
41: {
42: struct thread *head;
43: struct thread *tail;
44: int count;
45: };
46:
47: /* Master of the theads. */
48: struct thread_master
49: {
50: struct thread_list read;
51: struct thread_list write;
52: struct thread_list timer;
53: struct thread_list event;
54: struct thread_list ready;
55: struct thread_list unuse;
56: struct thread_list background;
57: fd_set readfd;
58: fd_set writefd;
59: fd_set exceptfd;
60: unsigned long alloc;
61: };
62:
63: typedef unsigned char thread_type;
64:
1.1.1.3 ! misho 65: /* ISO C99 maximum function name length is 63 */
! 66: #define FUNCNAME_LEN 64
! 67:
1.1 misho 68: /* Thread itself. */
69: struct thread
70: {
71: thread_type type; /* thread type */
72: thread_type add_type; /* thread type */
73: struct thread *next; /* next pointer of the thread */
74: struct thread *prev; /* previous pointer of the thread */
75: struct thread_master *master; /* pointer to the struct thread_master. */
76: int (*func) (struct thread *); /* event function */
77: void *arg; /* event argument */
78: union {
79: int val; /* second argument of the event. */
80: int fd; /* file descriptor in case of read/write. */
81: struct timeval sands; /* rest of time sands value. */
82: } u;
1.1.1.3 ! misho 83: struct timeval real;
1.1 misho 84: struct cpu_thread_history *hist; /* cache pointer to cpu_history */
1.1.1.3 ! misho 85: char funcname[FUNCNAME_LEN];
1.1 misho 86: };
87:
88: struct cpu_thread_history
89: {
90: int (*func)(struct thread *);
91: unsigned int total_calls;
92: struct time_stats
93: {
94: unsigned long total, max;
95: } real;
96: #ifdef HAVE_RUSAGE
97: struct time_stats cpu;
98: #endif
99: thread_type types;
1.1.1.3 ! misho 100: char funcname[FUNCNAME_LEN];
1.1 misho 101: };
102:
103: /* Clocks supported by Quagga */
104: enum quagga_clkid {
105: QUAGGA_CLK_REALTIME = 0, /* ala gettimeofday() */
106: QUAGGA_CLK_MONOTONIC, /* monotonic, against an indeterminate base */
107: QUAGGA_CLK_REALTIME_STABILISED, /* like realtime, but non-decrementing */
108: };
109:
110: /* Thread types. */
111: #define THREAD_READ 0
112: #define THREAD_WRITE 1
113: #define THREAD_TIMER 2
114: #define THREAD_EVENT 3
115: #define THREAD_READY 4
116: #define THREAD_BACKGROUND 5
117: #define THREAD_UNUSED 6
118: #define THREAD_EXECUTE 7
119:
120: /* Thread yield time. */
121: #define THREAD_YIELD_TIME_SLOT 10 * 1000L /* 10ms */
122:
123: /* Macros. */
124: #define THREAD_ARG(X) ((X)->arg)
125: #define THREAD_FD(X) ((X)->u.fd)
126: #define THREAD_VAL(X) ((X)->u.val)
127:
128: #define THREAD_READ_ON(master,thread,func,arg,sock) \
129: do { \
130: if (! thread) \
131: thread = thread_add_read (master, func, arg, sock); \
132: } while (0)
133:
134: #define THREAD_WRITE_ON(master,thread,func,arg,sock) \
135: do { \
136: if (! thread) \
137: thread = thread_add_write (master, func, arg, sock); \
138: } while (0)
139:
140: #define THREAD_TIMER_ON(master,thread,func,arg,time) \
141: do { \
142: if (! thread) \
143: thread = thread_add_timer (master, func, arg, time); \
144: } while (0)
145:
1.1.1.2 misho 146: #define THREAD_TIMER_MSEC_ON(master,thread,func,arg,time) \
147: do { \
148: if (! thread) \
149: thread = thread_add_timer_msec (master, func, arg, time); \
150: } while (0)
151:
1.1 misho 152: #define THREAD_OFF(thread) \
153: do { \
154: if (thread) \
155: { \
156: thread_cancel (thread); \
157: thread = NULL; \
158: } \
159: } while (0)
160:
161: #define THREAD_READ_OFF(thread) THREAD_OFF(thread)
162: #define THREAD_WRITE_OFF(thread) THREAD_OFF(thread)
163: #define THREAD_TIMER_OFF(thread) THREAD_OFF(thread)
164:
165: #define thread_add_read(m,f,a,v) funcname_thread_add_read(m,f,a,v,#f)
166: #define thread_add_write(m,f,a,v) funcname_thread_add_write(m,f,a,v,#f)
167: #define thread_add_timer(m,f,a,v) funcname_thread_add_timer(m,f,a,v,#f)
168: #define thread_add_timer_msec(m,f,a,v) funcname_thread_add_timer_msec(m,f,a,v,#f)
169: #define thread_add_event(m,f,a,v) funcname_thread_add_event(m,f,a,v,#f)
170: #define thread_execute(m,f,a,v) funcname_thread_execute(m,f,a,v,#f)
171:
172: /* The 4th arg to thread_add_background is the # of milliseconds to delay. */
173: #define thread_add_background(m,f,a,v) funcname_thread_add_background(m,f,a,v,#f)
174:
175: /* Prototypes. */
176: extern struct thread_master *thread_master_create (void);
177: extern void thread_master_free (struct thread_master *);
178:
179: extern struct thread *funcname_thread_add_read (struct thread_master *,
180: int (*)(struct thread *),
181: void *, int, const char*);
182: extern struct thread *funcname_thread_add_write (struct thread_master *,
183: int (*)(struct thread *),
184: void *, int, const char*);
185: extern struct thread *funcname_thread_add_timer (struct thread_master *,
186: int (*)(struct thread *),
187: void *, long, const char*);
188: extern struct thread *funcname_thread_add_timer_msec (struct thread_master *,
189: int (*)(struct thread *),
190: void *, long, const char*);
191: extern struct thread *funcname_thread_add_event (struct thread_master *,
192: int (*)(struct thread *),
193: void *, int, const char*);
194: extern struct thread *funcname_thread_add_background (struct thread_master *,
195: int (*func)(struct thread *),
196: void *arg,
197: long milliseconds_to_delay,
198: const char *funcname);
199: extern struct thread *funcname_thread_execute (struct thread_master *,
200: int (*)(struct thread *),
201: void *, int, const char *);
202: extern void thread_cancel (struct thread *);
203: extern unsigned int thread_cancel_event (struct thread_master *, void *);
204: extern struct thread *thread_fetch (struct thread_master *, struct thread *);
205: extern void thread_call (struct thread *);
206: extern unsigned long thread_timer_remain_second (struct thread *);
207: extern int thread_should_yield (struct thread *);
208:
209: /* Internal libzebra exports */
210: extern void thread_getrusage (RUSAGE_T *);
211: extern struct cmd_element show_thread_cpu_cmd;
212: extern struct cmd_element clear_thread_cpu_cmd;
213:
214: /* replacements for the system gettimeofday(), clock_gettime() and
215: * time() functions, providing support for non-decrementing clock on
216: * all systems, and fully monotonic on /some/ systems.
217: */
218: extern int quagga_gettime (enum quagga_clkid, struct timeval *);
219: extern time_t quagga_time (time_t *);
220:
221: /* Returns elapsed real (wall clock) time. */
222: extern unsigned long thread_consumed_time(RUSAGE_T *after, RUSAGE_T *before,
223: unsigned long *cpu_time_elapsed);
224:
225: /* Global variable containing a recent result from gettimeofday. This can
226: be used instead of calling gettimeofday if a recent value is sufficient.
227: This is guaranteed to be refreshed before a thread is called. */
228: extern struct timeval recent_time;
229: /* Similar to recent_time, but a monotonically increasing time value */
230: extern struct timeval recent_relative_time (void);
231: #endif /* _ZEBRA_THREAD_H */
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