4 * Implements the architecture independant portion of the LWKT
7 * $DragonFly: src/sys/sys/thread.h,v 1.29 2003/08/20 07:31:21 rob Exp $
10 #ifndef _SYS_THREAD_H_
11 #define _SYS_THREAD_H_
14 #include <sys/queue.h> /* TAILQ_* macros */
31 typedef struct lwkt_queue *lwkt_queue_t;
32 typedef struct lwkt_token *lwkt_token_t;
33 typedef struct lwkt_wait *lwkt_wait_t;
34 typedef struct lwkt_cpu_msg *lwkt_cpu_msg_t;
35 typedef struct lwkt_cpu_port *lwkt_cpu_port_t;
36 typedef struct lwkt_rwlock *lwkt_rwlock_t;
37 typedef struct lwkt_ipiq *lwkt_ipiq_t;
38 typedef struct thread *thread_t;
40 typedef TAILQ_HEAD(lwkt_queue, thread) lwkt_queue;
42 #ifndef _MACHINE_THREAD_H_
43 #include <machine/thread.h> /* md_thread */
45 #ifndef _SYS_MSGPORT_H_
46 #include <sys/msgport.h>
50 * Tokens arbitrate access to information. They are 'soft' arbitrators
51 * in that they are associated with cpus rather then threads, making the
52 * optimal aquisition case very fast if your cpu already happens to own the
53 * token you are requesting.
55 typedef struct lwkt_token {
56 int t_cpu; /* the current owner of the token */
57 int t_reqcpu; /* return ownership to this cpu on release */
58 int t_gen; /* generation number */
60 int t_pri; /* raise thread priority to hold token */
65 * Wait structures deal with blocked threads. Due to the way remote cpus
66 * interact with these structures stable storage must be used.
68 typedef struct lwkt_wait {
69 lwkt_queue wa_waitq; /* list of waiting threads */
70 lwkt_token wa_token; /* who currently owns the list */
75 #define MAXCPUFIFO 16 /* power of 2 */
76 #define MAXCPUFIFO_MASK (MAXCPUFIFO - 1)
78 typedef void (*ipifunc_t)(void *arg);
80 typedef struct lwkt_ipiq {
81 int ip_rindex; /* only written by target cpu */
82 int ip_xindex; /* writte by target, indicates completion */
83 int ip_windex; /* only written by source cpu */
84 ipifunc_t ip_func[MAXCPUFIFO];
85 void *ip_arg[MAXCPUFIFO];
89 * The standard message and queue structure used for communications between
90 * cpus. Messages are typically queued via a machine-specific non-linked
91 * FIFO matrix allowing any cpu to send a message to any other cpu without
94 typedef struct lwkt_cpu_msg {
95 void (*cm_func)(lwkt_cpu_msg_t msg); /* primary dispatch function */
96 int cm_code; /* request code if applicable */
97 int cm_cpu; /* reply to cpu */
98 thread_t cm_originator; /* originating thread for wakeup */
104 typedef struct lwkt_rwlock {
111 #define rw_token rw_wait.wa_token
114 * Thread structure. Note that ownership of a thread structure is special
115 * cased and there is no 'token'. A thread is always owned by the cpu
116 * represented by td_gd, any manipulation of the thread by some other cpu
117 * must be done through cpu_*msg() functions. e.g. you could request
118 * ownership of a thread that way, or hand a thread off to another cpu.
120 * NOTE: td_pri is bumped by TDPRI_CRIT when entering a critical section,
121 * but this does not effect how the thread is scheduled by LWKT.
126 TAILQ_ENTRY(thread) td_threadq;
127 TAILQ_ENTRY(thread) td_allq;
128 lwkt_port td_msgport; /* built-in message port for replies */
129 struct proc *td_proc; /* (optional) associated process */
130 struct pcb *td_pcb; /* points to pcb and top of kstack */
131 struct globaldata *td_gd; /* associated with this cpu */
132 const char *td_wmesg; /* string name for blockage */
133 void *td_wchan; /* waiting on channel */
134 int td_pri; /* 0-31, 31=highest priority (note 1) */
135 int td_flags; /* THF flags */
136 int td_gen; /* wait queue chasing generation number */
138 void (*td_preemptable)(struct thread *td, int critpri);
139 void (*td_release)(struct thread *td);
141 struct md_intr_info *intdata;
143 char *td_kstack; /* kernel stack */
144 char *td_sp; /* kernel stack pointer for LWKT restore */
145 void (*td_switch)(struct thread *ntd);
146 lwkt_wait_t td_wait; /* thread sitting on wait structure */
147 u_int64_t td_uticks; /* Statclock hits in user mode (uS) */
148 u_int64_t td_sticks; /* Statclock hits in system mode (uS) */
149 u_int64_t td_iticks; /* Statclock hits processing intr (uS) */
150 int td_locks; /* lockmgr lock debugging YYY */
151 int td_refs; /* hold position in gd_tdallq / hold free */
153 int td_mpcount; /* MP lock held (count) */
157 char td_comm[MAXCOMLEN+1]; /* typ 16+1 bytes */
158 struct thread *td_preempted; /* we preempted this thread */
159 struct md_thread td_mach;
163 * Thread flags. Note that TDF_RUNNING is cleared on the old thread after
164 * we switch to the new one, which is necessary because LWKTs don't need
165 * to hold the BGL. This flag is used by the exit code and the managed
166 * thread migration code.
168 * LWKT threads stay on their (per-cpu) run queue while running, not to
169 * be confused with user processes which are removed from the user scheduling
170 * run queue while actually running.
172 #define TDF_RUNNING 0x0001 /* thread still active */
173 #define TDF_RUNQ 0x0002 /* on an LWKT run queue */
174 #define TDF_PREEMPT_LOCK 0x0004 /* I have been preempted */
175 #define TDF_PREEMPT_DONE 0x0008 /* acknowledge preemption complete */
176 #define TDF_IDLE_NOHLT 0x0010 /* we need to spin */
178 #define TDF_ONALLQ 0x0100 /* on gd_tdallq */
179 #define TDF_ALLOCATED_THREAD 0x0200 /* zalloc allocated thread */
180 #define TDF_ALLOCATED_STACK 0x0400 /* zalloc allocated stack */
181 #define TDF_VERBOSE 0x0800 /* verbose on exit */
182 #define TDF_DEADLKTREAT 0x1000 /* special lockmgr deadlock treatment */
183 #define TDF_STOPREQ 0x2000 /* suspend_kproc */
184 #define TDF_WAKEREQ 0x4000 /* resume_kproc */
185 #define TDF_TIMEOUT 0x8000 /* tsleep timeout */
188 * Thread priorities. Typically only one thread from any given
189 * user process scheduling queue is on the LWKT run queue at a time.
190 * Remember that there is one LWKT run queue per cpu.
192 * Critical sections are handled by bumping td_pri above TDPRI_MAX, which
193 * causes interrupts to be masked as they occur. When this occurs a
194 * rollup flag will be set in mycpu->gd_reqflags.
196 #define TDPRI_IDLE_THREAD 0 /* the idle thread */
197 #define TDPRI_USER_IDLE 4 /* user scheduler idle */
198 #define TDPRI_USER_NORM 6 /* user scheduler normal */
199 #define TDPRI_USER_REAL 8 /* user scheduler real time */
200 #define TDPRI_KERN_USER 10 /* kernel / block in syscall */
201 #define TDPRI_KERN_DAEMON 12 /* kernel daemon (pageout, etc) */
202 #define TDPRI_SOFT_NORM 14 /* kernel / normal */
203 #define TDPRI_SOFT_TIMER 16 /* kernel / timer */
204 #define TDPRI_EXITING 19 /* exiting thread */
205 #define TDPRI_INT_SUPPORT 20 /* kernel / high priority support */
206 #define TDPRI_INT_LOW 27 /* low priority interrupt */
207 #define TDPRI_INT_MED 28 /* medium priority interrupt */
208 #define TDPRI_INT_HIGH 29 /* high priority interrupt */
211 #define TDPRI_MASK 31
212 #define TDPRI_CRIT 32 /* high bits of td_pri used for crit */
214 #define CACHE_NTHREADS 6
218 extern struct vm_zone *thread_zone;
220 extern struct thread *lwkt_alloc_thread(struct thread *template);
221 extern void lwkt_init_thread(struct thread *td, void *stack, int flags,
222 struct globaldata *gd);
223 extern void lwkt_set_comm(thread_t td, const char *ctl, ...);
224 extern void lwkt_wait_free(struct thread *td);
225 extern void lwkt_free_thread(struct thread *td);
226 extern void lwkt_init_wait(struct lwkt_wait *w);
227 extern void lwkt_gdinit(struct globaldata *gd);
228 extern void lwkt_switch(void);
229 extern void lwkt_maybe_switch(void);
230 extern void lwkt_preempt(thread_t ntd, int critpri);
231 extern void lwkt_schedule(thread_t td);
232 extern void lwkt_schedule_self(void);
233 extern void lwkt_deschedule(thread_t td);
234 extern void lwkt_deschedule_self(void);
235 extern void lwkt_acquire(thread_t td);
236 extern void lwkt_yield(void);
237 extern void lwkt_yield_quick(void);
238 extern void lwkt_hold(thread_t td);
239 extern void lwkt_rele(thread_t td);
241 extern void lwkt_block(lwkt_wait_t w, const char *wmesg, int *gen);
242 extern void lwkt_signal(lwkt_wait_t w, int count);
243 extern int lwkt_trytoken(lwkt_token_t tok);
244 extern int lwkt_gettoken(lwkt_token_t tok);
245 extern int lwkt_gentoken(lwkt_token_t tok, int *gen);
246 extern void lwkt_reltoken(lwkt_token_t tok);
247 extern void lwkt_inittoken(lwkt_token_t tok);
248 extern int lwkt_regettoken(lwkt_token_t tok);
249 extern void lwkt_rwlock_init(lwkt_rwlock_t lock);
250 extern void lwkt_exlock(lwkt_rwlock_t lock, const char *wmesg);
251 extern void lwkt_shlock(lwkt_rwlock_t lock, const char *wmesg);
252 extern void lwkt_exunlock(lwkt_rwlock_t lock);
253 extern void lwkt_shunlock(lwkt_rwlock_t lock);
254 extern void lwkt_setpri(thread_t td, int pri);
255 extern void lwkt_setpri_self(int pri);
256 extern int lwkt_send_ipiq(int dcpu, ipifunc_t func, void *arg);
257 extern void lwkt_send_ipiq_mask(u_int32_t mask, ipifunc_t func, void *arg);
258 extern void lwkt_wait_ipiq(int dcpu, int seq);
259 extern void lwkt_process_ipiq(void);
260 extern void crit_panic(void);
261 extern struct proc *lwkt_preempted_proc(void);
264 extern int lwkt_create (void (*func)(void *), void *arg, struct thread **ptd,
265 struct thread *template, int tdflags,
266 const char *ctl, ...);
267 extern void lwkt_exit (void) __dead2;