Add 64 bit display output support to sysctl plus convenient macros.
[dragonfly.git] / sys / sys / thread.h
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1/*
2 * SYS/THREAD.H
3 *
4 * Implements the architecture independant portion of the LWKT
5 * subsystem.
6 *
b68b7282 7 * $DragonFly: src/sys/sys/thread.h,v 1.14 2003/06/29 05:29:31 dillon Exp $
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8 */
9
10#ifndef _SYS_THREAD_H_
11#define _SYS_THREAD_H_
12
f1d1c3fa 13struct globaldata;
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14struct proc;
15struct thread;
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16struct lwkt_queue;
17struct lwkt_token;
18struct lwkt_wait;
19struct lwkt_msg;
20struct lwkt_port;
21struct lwkt_cpu_msg;
22struct lwkt_cpu_port;
23struct lwkt_rwlock;
24
25typedef struct lwkt_queue *lwkt_queue_t;
26typedef struct lwkt_token *lwkt_token_t;
27typedef struct lwkt_wait *lwkt_wait_t;
28typedef struct lwkt_msg *lwkt_msg_t;
29typedef struct lwkt_port *lwkt_port_t;
30typedef struct lwkt_cpu_msg *lwkt_cpu_msg_t;
31typedef struct lwkt_cpu_port *lwkt_cpu_port_t;
32typedef struct lwkt_rwlock *lwkt_rwlock_t;
33typedef struct thread *thread_t;
34
35typedef TAILQ_HEAD(lwkt_queue, thread) lwkt_queue;
36typedef TAILQ_HEAD(lwkt_msg_queue, lwkt_msg) lwkt_msg_queue;
37
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38#ifndef _MACHINE_THREAD_H_
39#include <machine/thread.h> /* md_thread */
40#endif
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41
42/*
43 * Tokens arbitrate access to information. They are 'soft' arbitrators
44 * in that they are associated with cpus rather then threads, making the
45 * optimal aquisition case very fast if your cpu already happens to own the
46 * token you are requesting.
47 */
48typedef struct lwkt_token {
49 int t_cpu; /* the current owner of the token */
50 int t_reqcpu; /* return ownership to this cpu on release */
51#if 0
52 int t_pri; /* raise thread priority to hold token */
53#endif
54} lwkt_token;
55
56/*
57 * Wait structures deal with blocked threads. Due to the way remote cpus
58 * interact with these structures stable storage must be used.
59 */
60typedef struct lwkt_wait {
61 lwkt_queue wa_waitq; /* list of waiting threads */
62 lwkt_token wa_token; /* who currently owns the list */
63 int wa_gen;
64 int wa_count;
65} lwkt_wait;
66
67/*
68 * The standarding message and port structure for communications between
69 * threads.
70 */
71typedef struct lwkt_msg {
72 TAILQ_ENTRY(lwkt_msg) ms_node;
73 lwkt_port_t ms_replyport;
74 int ms_cmd;
75 int ms_flags;
76 int ms_error;
77} lwkt_msg;
78
79#define MSGF_DONE 0x0001
80#define MSGF_REPLY 0x0002
81#define MSGF_QUEUED 0x0004
82
83typedef struct lwkt_port {
84 lwkt_msg_queue mp_msgq;
85 lwkt_wait mp_wait;
86} lwkt_port;
2df9fa87 87
f1d1c3fa 88#define mp_token mp_wait.wa_token
2df9fa87 89
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90/*
91 * The standard message and queue structure used for communications between
92 * cpus. Messages are typically queued via a machine-specific non-linked
93 * FIFO matrix allowing any cpu to send a message to any other cpu without
94 * blocking.
95 */
96typedef struct lwkt_cpu_msg {
97 void (*cm_func)(lwkt_cpu_msg_t msg); /* primary dispatch function */
98 int cm_code; /* request code if applicable */
99 int cm_cpu; /* reply to cpu */
100 thread_t cm_originator; /* originating thread for wakeup */
101} lwkt_cpu_msg;
102
103/*
104 * reader/writer lock
105 */
106typedef struct lwkt_rwlock {
ae8050a4 107 lwkt_wait rw_wait;
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108 thread_t rw_owner;
109 int rw_count;
17d46a8c 110 int rw_requests;
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111} lwkt_rwlock;
112
113#define rw_token rw_wait.wa_token
114
115/*
116 * Thread structure. Note that ownership of a thread structure is special
117 * cased and there is no 'token'. A thread is always owned by td_cpu and
118 * any manipulation of the thread by some other cpu must be done through
119 * cpu_*msg() functions. e.g. you could request ownership of a thread that
120 * way, or hand a thread off to another cpu by changing td_cpu and sending
121 * a schedule request to the other cpu.
122 */
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123struct thread {
124 TAILQ_ENTRY(thread) td_threadq;
125 struct proc *td_proc; /* (optional) associated process */
126 struct pcb *td_pcb; /* points to pcb and top of kstack */
ae8050a4 127 const char *td_wmesg; /* string name for blockage */
0cfcada1 128 void *td_wchan; /* waiting on channel */
f1d1c3fa 129 int td_cpu; /* cpu owning the thread */
2df9fa87 130 int td_pri; /* 0-31, 0=highest priority */
8ad65e08 131 int td_flags; /* THF flags */
f1d1c3fa 132 int td_gen; /* wait queue chasing generation number */
7e1d4bf4 133 char *td_kstack; /* kernel stack */
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134 char *td_sp; /* kernel stack pointer for LWKT restore */
135 void (*td_switch)(struct thread *ntd);
f1d1c3fa 136 lwkt_wait_t td_wait; /* thread sitting on wait structure */
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137 u_int64_t td_uticks; /* Statclock hits in user mode (uS) */
138 u_int64_t td_sticks; /* Statclock hits in system mode (uS) */
139 u_int64_t td_iticks; /* Statclock hits processing intr (uS) */
dadab5e9 140 int td_locks; /* lockmgr lock debugging YYY */
0cfcada1 141 char td_comm[MAXCOMLEN+1]; /* typ 16+1 bytes */
99df837e 142 struct thread *td_preempted; /* we preempted this thread */
85100692 143 struct md_thread td_mach;
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144};
145
8ad65e08 146/*
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147 * Thread flags. Note that TDF_EXITED is set by the appropriate switchout
148 * code when a thread exits, after it has switched to another stack and
149 * cleaned up the MMU state.
8ad65e08 150 */
99df837e 151#define TDF_EXITED 0x0001 /* thread finished exiting */
8ad65e08 152#define TDF_RUNQ 0x0002 /* on run queue */
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153#define TDF_PREEMPTED 0x0004 /* thread is currently preempted */
154#define TDF_ALLOCATED_THREAD 0x0200 /* zalloc allocated thread */
155#define TDF_ALLOCATED_STACK 0x0400 /* zalloc allocated stack */
156#define TDF_VERBOSE 0x0800 /* verbose on exit */
dadab5e9 157#define TDF_DEADLKTREAT 0x1000 /* special lockmgr deadlock treatment */
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158#define TDF_STOPREQ 0x2000 /* suspend_kproc */
159#define TDF_WAKEREQ 0x4000 /* resume_kproc */
160#define TDF_TIMEOUT 0x8000 /* tsleep timeout */
8ad65e08 161
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162/*
163 * Thread priorities. Typically only one thread from any given
164 * user process scheduling queue is on the LWKT run queue at a time.
165 * Remember that there is one LWKT run queue per cpu.
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166 *
167 * Critical sections are handled by bumping td_pri above TDPRI_MAX, which
168 * causes interrupts to be masked as they occur. When this occurs
169 * mycpu->gd_reqpri will be raised (possibly just set to TDPRI_CRIT for
170 * interrupt masking).
2df9fa87 171 */
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172#define TDPRI_IDLE_THREAD 0 /* the idle thread */
173#define TDPRI_USER_IDLE 4 /* user scheduler idle */
174#define TDPRI_USER_NORM 6 /* user scheduler normal */
175#define TDPRI_USER_REAL 8 /* user scheduler real time */
176#define TDPRI_KERN_USER 10 /* kernel / block in syscall */
177#define TDPRI_SOFT_NORM 14 /* kernel / normal */
178#define TDPRI_SOFT_TIMER 16 /* kernel / timer */
ae8050a4 179#define TDPRI_EXITING 19 /* exiting thread */
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180#define TDPRI_INT_SUPPORT 20 /* kernel / high priority support */
181#define TDPRI_INT_LOW 27 /* low priority interrupt */
182#define TDPRI_INT_MED 28 /* medium priority interrupt */
183#define TDPRI_INT_HIGH 29 /* high priority interrupt */
184#define TDPRI_MAX 31
185
186#define TDPRI_MASK 31
187#define TDPRI_CRIT 32 /* high bits of td_pri used for crit */
2df9fa87 188
ef0fdad1 189#define CACHE_NTHREADS 6
7e1d4bf4 190
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191#ifdef _KERNEL
192
193extern struct vm_zone *thread_zone;
194
ef0fdad1 195extern struct thread *lwkt_alloc_thread(struct thread *template);
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196extern void lwkt_init_thread(struct thread *td, void *stack, int flags);
197extern void lwkt_free_thread(struct thread *td);
7d0bac62 198extern void lwkt_init_wait(struct lwkt_wait *w);
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199extern void lwkt_gdinit(struct globaldata *gd);
200extern void lwkt_switch(void);
b68b7282 201extern void lwkt_preempt(thread_t ntd, int id);
8ad65e08 202extern void lwkt_schedule(thread_t td);
f1d1c3fa 203extern void lwkt_schedule_self(void);
8ad65e08 204extern void lwkt_deschedule(thread_t td);
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205extern void lwkt_deschedule_self(void);
206extern void lwkt_yield(void);
207extern void lwkt_yield_quick(void);
208
ae8050a4 209extern void lwkt_block(lwkt_wait_t w, const char *wmesg, int *gen);
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210extern void lwkt_signal(lwkt_wait_t w);
211extern void lwkt_gettoken(lwkt_token_t tok);
212extern void lwkt_reltoken(lwkt_token_t tok);
213extern int lwkt_regettoken(lwkt_token_t tok);
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214extern void lwkt_rwlock_init(lwkt_rwlock_t lock);
215extern void lwkt_exlock(lwkt_rwlock_t lock, const char *wmesg);
216extern void lwkt_shlock(lwkt_rwlock_t lock, const char *wmesg);
217extern void lwkt_exunlock(lwkt_rwlock_t lock);
218extern void lwkt_shunlock(lwkt_rwlock_t lock);
8ad65e08 219
99df837e 220extern int lwkt_create (void (*func)(void *), void *arg, struct thread **ptd,
ef0fdad1 221 struct thread *template, int tdflags,
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222 const char *ctl, ...);
223extern void lwkt_exit __P((void)) __dead2;
224
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225#endif
226
227#endif
228