1: /* Thread management routine header.
2: * Copyright (C) 1998 Kunihiro Ishiguro
3: * Portions Copyright (c) 2008 Everton da Silva Marques <everton.marques@gmail.com>
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:
26: #include <zebra.h>
27:
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:
65: /* Thread itself. */
66: struct thread
67: {
68: thread_type type; /* thread type */
69: thread_type add_type; /* thread type */
70: struct thread *next; /* next pointer of the thread */
71: struct thread *prev; /* previous pointer of the thread */
72: struct thread_master *master; /* pointer to the struct thread_master. */
73: int (*func) (struct thread *); /* event function */
74: void *arg; /* event argument */
75: union {
76: int val; /* second argument of the event. */
77: int fd; /* file descriptor in case of read/write. */
78: struct timeval sands; /* rest of time sands value. */
79: } u;
80: RUSAGE_T ru; /* Indepth usage info. */
81: struct cpu_thread_history *hist; /* cache pointer to cpu_history */
82: char* funcname;
83: };
84:
85: struct cpu_thread_history
86: {
87: int (*func)(struct thread *);
88: char *funcname;
89: unsigned int total_calls;
90: struct time_stats
91: {
92: unsigned long total, max;
93: } real;
94: #ifdef HAVE_RUSAGE
95: struct time_stats cpu;
96: #endif
97: thread_type types;
98: };
99:
100: /* Clocks supported by Quagga */
101: enum quagga_clkid {
102: QUAGGA_CLK_REALTIME = 0, /* ala gettimeofday() */
103: QUAGGA_CLK_MONOTONIC, /* monotonic, against an indeterminate base */
104: QUAGGA_CLK_REALTIME_STABILISED, /* like realtime, but non-decrementing */
105: };
106:
107: /* Thread types. */
108: #define THREAD_READ 0
109: #define THREAD_WRITE 1
110: #define THREAD_TIMER 2
111: #define THREAD_EVENT 3
112: #define THREAD_READY 4
113: #define THREAD_BACKGROUND 5
114: #define THREAD_UNUSED 6
115: #define THREAD_EXECUTE 7
116:
117: /* Thread yield time. */
118: #define THREAD_YIELD_TIME_SLOT 10 * 1000L /* 10ms */
119:
120: /* Macros. */
121: #define THREAD_ARG(X) ((X)->arg)
122: #define THREAD_FD(X) ((X)->u.fd)
123: #define THREAD_VAL(X) ((X)->u.val)
124:
125: #define THREAD_READ_ON(master,thread,func,arg,sock) \
126: do { \
127: if (! thread) \
128: thread = thread_add_read (master, func, arg, sock); \
129: } while (0)
130:
131: #define THREAD_WRITE_ON(master,thread,func,arg,sock) \
132: do { \
133: if (! thread) \
134: thread = thread_add_write (master, func, arg, sock); \
135: } while (0)
136:
137: #define THREAD_TIMER_ON(master,thread,func,arg,time) \
138: do { \
139: if (! thread) \
140: thread = thread_add_timer (master, func, arg, time); \
141: } while (0)
142:
143: #define THREAD_TIMER_MSEC_ON(master,thread,func,arg,time) \
144: do { \
145: if (! thread) \
146: thread = thread_add_timer_msec (master, func, arg, time); \
147: } while (0)
148:
149: #define THREAD_OFF(thread) \
150: do { \
151: if (thread) \
152: { \
153: thread_cancel (thread); \
154: thread = NULL; \
155: } \
156: } while (0)
157:
158: #define THREAD_READ_OFF(thread) THREAD_OFF(thread)
159: #define THREAD_WRITE_OFF(thread) THREAD_OFF(thread)
160: #define THREAD_TIMER_OFF(thread) THREAD_OFF(thread)
161:
162: #define thread_add_read(m,f,a,v) funcname_thread_add_read(m,f,a,v,#f)
163: #define thread_add_write(m,f,a,v) funcname_thread_add_write(m,f,a,v,#f)
164: #define thread_add_timer(m,f,a,v) funcname_thread_add_timer(m,f,a,v,#f)
165: #define thread_add_timer_msec(m,f,a,v) funcname_thread_add_timer_msec(m,f,a,v,#f)
166: #define thread_add_event(m,f,a,v) funcname_thread_add_event(m,f,a,v,#f)
167: #define thread_execute(m,f,a,v) funcname_thread_execute(m,f,a,v,#f)
168:
169: /* The 4th arg to thread_add_background is the # of milliseconds to delay. */
170: #define thread_add_background(m,f,a,v) funcname_thread_add_background(m,f,a,v,#f)
171:
172: /* Prototypes. */
173: extern struct thread_master *thread_master_create (void);
174: extern void thread_master_free (struct thread_master *);
175:
176: extern struct thread *funcname_thread_add_read (struct thread_master *,
177: int (*)(struct thread *),
178: void *, int, const char*);
179: extern struct thread *funcname_thread_add_write (struct thread_master *,
180: int (*)(struct thread *),
181: void *, int, const char*);
182: extern struct thread *funcname_thread_add_timer (struct thread_master *,
183: int (*)(struct thread *),
184: void *, long, const char*);
185: extern struct thread *funcname_thread_add_timer_msec (struct thread_master *,
186: int (*)(struct thread *),
187: void *, long, const char*);
188: extern struct thread *funcname_thread_add_event (struct thread_master *,
189: int (*)(struct thread *),
190: void *, int, const char*);
191: extern struct thread *funcname_thread_add_background (struct thread_master *,
192: int (*func)(struct thread *),
193: void *arg,
194: long milliseconds_to_delay,
195: const char *funcname);
196: extern struct thread *funcname_thread_execute (struct thread_master *,
197: int (*)(struct thread *),
198: void *, int, const char *);
199: extern void thread_cancel (struct thread *);
200: extern unsigned int thread_cancel_event (struct thread_master *, void *);
201: extern struct thread *thread_fetch (struct thread_master *, struct thread *);
202: extern void thread_call (struct thread *);
203: extern unsigned long thread_timer_remain_second (struct thread *);
204: extern int thread_should_yield (struct thread *);
205:
206: /* Internal libzebra exports */
207: extern void thread_getrusage (RUSAGE_T *);
208: extern struct cmd_element show_thread_cpu_cmd;
209: extern struct cmd_element clear_thread_cpu_cmd;
210:
211: /* replacements for the system gettimeofday(), clock_gettime() and
212: * time() functions, providing support for non-decrementing clock on
213: * all systems, and fully monotonic on /some/ systems.
214: */
215: extern int quagga_gettime (enum quagga_clkid, struct timeval *);
216: extern time_t quagga_time (time_t *);
217:
218: /* Returns elapsed real (wall clock) time. */
219: extern unsigned long thread_consumed_time(RUSAGE_T *after, RUSAGE_T *before,
220: unsigned long *cpu_time_elapsed);
221:
222: /* Global variable containing a recent result from gettimeofday. This can
223: be used instead of calling gettimeofday if a recent value is sufficient.
224: This is guaranteed to be refreshed before a thread is called. */
225: extern struct timeval recent_time;
226: /* Similar to recent_time, but a monotonically increasing time value */
227: extern struct timeval recent_relative_time (void);
228: #endif /* _ZEBRA_THREAD_H */
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