Annotation of prex-old/sys/include/thread.h, Revision 1.1.1.1
1.1 nbrk 1: /*-
2: * Copyright (c) 2005-2007, Kohsuke Ohtani
3: * All rights reserved.
4: *
5: * Redistribution and use in source and binary forms, with or without
6: * modification, are permitted provided that the following conditions
7: * are met:
8: * 1. Redistributions of source code must retain the above copyright
9: * notice, this list of conditions and the following disclaimer.
10: * 2. Redistributions in binary form must reproduce the above copyright
11: * notice, this list of conditions and the following disclaimer in the
12: * documentation and/or other materials provided with the distribution.
13: * 3. Neither the name of the author nor the names of any co-contributors
14: * may be used to endorse or promote products derived from this software
15: * without specific prior written permission.
16: *
17: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
18: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20: * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
21: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27: * SUCH DAMAGE.
28: */
29:
30: #ifndef _THREAD_H
31: #define _THREAD_H
32:
33: #include <queue.h>
34: #include <event.h>
35: #include <timer.h>
36: #include <arch.h>
37:
38: struct mutex;
39:
40: /*
41: * Description of a thread.
42: */
43: struct thread {
44: int magic; /* magic number */
45: task_t task; /* pointer to owner task */
46: struct list task_link; /* link for threads in same task */
47: struct queue link; /* linkage on scheduling queue */
48: int state; /* thread state */
49: int policy; /* scheduling policy */
50: int prio; /* current priority */
51: int base_prio; /* base priority */
52: int ticks_left; /* remaining ticks to run */
53: u_int total_ticks; /* total running ticks */
54: int need_resched; /* true if rescheduling is needed */
55: int lock_count; /* schedule lock counter */
56: int suspend_count; /* suspend counter */
57: struct event *sleep_event; /* sleep event */
58: int sleep_result; /* sleep result */
59: struct timer timeout; /* thread timer */
60: struct timer *periodic; /* pointer to periodic timer */
61: struct queue ipc_link; /* linkage on IPC queue */
62: void *msg_addr; /* kernel address of IPC message */
63: size_t msg_size; /* size of IPC message */
64: struct thread *sender; /* thread that sends IPC message */
65: struct thread *receiver; /* thread that receives IPC message */
66: object_t send_obj; /* IPC object sending to */
67: object_t recv_obj; /* IPC object receiving from */
68: uint32_t exc_bitmap; /* bitmap of pending exceptions */
69: struct list mutexes; /* mutexes locked by this thread */
70: struct mutex *wait_mutex; /* mutex pointer currently waiting */
71: void *kstack; /* base address of kernel stack */
72: struct context context; /* machine specific context */
73: };
74:
75: #define thread_valid(th) (kern_area(th) && ((th)->magic == THREAD_MAGIC))
76:
77: /*
78: * Thread state
79: */
80: #define TH_RUN 0x00 /* running or ready to run */
81: #define TH_SLEEP 0x01 /* awaiting an event */
82: #define TH_SUSPEND 0x02 /* suspend count is not 0 */
83: #define TH_EXIT 0x04 /* terminated */
84:
85: /*
86: * Sleep result
87: */
88: #define SLP_SUCCESS 0 /* success */
89: #define SLP_BREAK 1 /* break due to some reasons */
90: #define SLP_TIMEOUT 2 /* timeout */
91: #define SLP_INVAL 3 /* target event becomes invalid */
92: #define SLP_INTR 4 /* interrupted by exception */
93:
94: /*
95: * Priorities
96: */
97: #define PRIO_TIMER 15 /* priority for timer thread */
98: #define PRIO_IST 16 /* top priority for interrupt threads */
99: #define PRIO_DPC 33 /* priority for Deferred Procedure Call */
100: #define PRIO_IDLE 255 /* priority for idle thread */
101: #define PRIO_USER CONFIG_USER_PRIO
102:
103: #define MAX_PRIO 0
104: #define MIN_PRIO 255
105: #define NR_PRIOS 256 /* number of thread priority */
106:
107: /*
108: * Scheduling operations for thread_schedparam().
109: */
110: #define OP_GETPRIO 0 /* get scheduling priority */
111: #define OP_SETPRIO 1 /* set scheduling priority */
112: #define OP_GETPOLICY 2 /* get scheduling policy */
113: #define OP_SETPOLICY 3 /* set scheduling policy */
114:
115: extern int thread_create(task_t, thread_t *);
116: extern int thread_terminate(thread_t);
117: extern int thread_kill(thread_t);
118: extern int thread_load(thread_t, void (*)(void), void *);
119: extern thread_t thread_self(void);
120: extern void thread_yield(void);
121: extern int thread_suspend(thread_t);
122: extern int thread_resume(thread_t);
123: extern int thread_schedparam(thread_t, int, int *);
124: extern void thread_idle(void);
125: extern int thread_info(struct info_thread *);
126: extern thread_t kernel_thread(int, void (*)(u_long), u_long);
127: extern void thread_dump(void);
128: extern void thread_init(void);
129:
130: #endif /* !_THREAD_H */
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