linux下的sched头文件.docx

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linux下的sched头文件.docx

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linux下的sched头文件.docx

linux下的sched头文件

*include/linux/schedh

#ifndef_LINUX_SCHED_H

#define_LINUX_SCHED_H

#include/*forHZ*/

externunsignedlongevent;

#include

structexec_domain;

*cloningflags:

#defineCSIGNAL0x000000ff/*signalmasktobesentatexit*/

#defineCLONE_VM0x00000100/*setifVMsharedbetweenprocesses*/

#defineCLONE_FS0x00000200/*setiffsinfosharedbetweenprocesses*/

#defineCLONE_FILES0x00000400/*setifopenfilessharedbetweenprocesses*/

#defineCLONE_SIGHAND0x00000800/*setifsignalhandlersandblockedsignalsshared*/

#defineCLONE_PID0x00001000/*setifpidshared*/

#defineCLONE_PTRACE0x00002000/*setifwewanttolettracingcontinueonthechildtoo*/

#defineCLONE_VFORK0x00004000/*setiftheparentwantsthechildtowakeituponmm_release*/

#defineCLONE_PARENT0x00008000/*setifwewanttohavethesameparentasthecloner*/

#defineCLONE_THREAD0x00010000/*Samethreadgroup?

#defineCLONE_NEWNS0x00020000/*Newnamespacegroup?

#defineCLONE_SIGNAL（CLONE_SIGHAND|CLONE_THREAD）

*Thesearetheconstantusedtofakethefixed-pointload-average

*counting.Somenotes:

*-11bitfractionsexpandto22bitsbythemultiplies:

thisgives

*aload-averageprecisionof10bitsinteger+11bitsfractional

*-ifyouwanttocountload-averagesmoreoften,youneedmore

*precision,orroundingwillgetyou.With2-secondcountingfreq,

*theEXP_nvalueswouldbe1981,2034and2043ifstillusingonly

*11bitfractions.

externunsignedlongavenrun[];/*Loadaverages*/

#defineFSHIFT11/*nrofbitsofprecision*/

#defineFIXED_1（1<

#defineLOAD_FREQ（5*HZ）/*5secintervals*/

#defineEXP_11884/*1/exp（5sec/1min）asfixed-point*/

#defineEXP_52014/*1/exp（5sec/5min）*/

#defineEXP_152037/*1/exp（5sec/15min）*/

#defineCALC_LOAD（load,exp,n）\

load*=exp;\

load+=n*（FIXED_1-exp）;\

load>>=FSHIFT;

#defineCT_TO_SECS（x）（（x）/HZ）

#defineCT_TO_USECS（x）（（（x）%HZ）*1000000/HZ）

externintnr_threads;

externintlast_pid;

externunsignedlongnr_running（void）;

externunsignedlongnr_uninterruptible（void）;

#include

//进程状态

#defineTASK_RUNNING0

#defineTASK_INTERRUPTIBLE1

#defineTASK_UNINTERRUPTIBLE2

#defineTASK_ZOMBIE4

#defineTASK_STOPPED8

#define__set_task_state（tsk,state_value）\

do{（tsk）->state=（state_value）;}while（0）

#ifdefCONFIG_SMP

#defineset_task_state（tsk,state_value）\

set_mb（（tsk）->state,（state_value））

#else

#defineset_task_state（tsk,state_value）\

__set_task_state（（tsk）,（state_value））

#endif

#define__set_current_state（state_value）\

do{current->state=（state_value）;}while（0）

#ifdefCONFIG_SMP

#defineset_current_state（state_value）\

set_mb（current->state,（state_value））

#else

#defineset_current_state（state_value）\

__set_current_state（state_value）

#endif

*Schedulingpolicies

#defineSCHED_OTHER0

#defineSCHED_FIFO1

#defineSCHED_RR2

structsched_param{

intsched_priority;

};

structcompletion;

#ifdef__KERNEL__

#include

*Thisserializes"schedule（）"andalsoprotects

*therun-queuefromdeletions/modifications（but

*_adding_tothebeginningoftherun-queuehas

*aseparatelock）.

externrwlock_ttasklist_lock;

externspinlock_tmmlist_lock;

typedefstructtask_structtask_t;//将task_t定义为task_sturct的结构类型

externvoidsched_init（void）;

externvoidinit_idle（task_t*idle,intcpu）;

externvoidshow_state（void）;

externvoidshow_stack（unsignedlong*esp）;

externvoidcpu_init（void）;

externvoidtrap_init（void）;

externvoidupdate_process_times（intuser）;

externvoidupdate_one_process（task_t*p,unsignedlonguser,

unsignedlongsystem,intcpu）;

externvoidscheduler_tick（intuser_tick,intsystem）;

externvoidmigration_init（void）;

externunsignedlongcache_decay_ticks;

externintset_user（uid_tnew_ruid,intdumpclear）;

#defineMAX_SCHEDULE_TIMEOUTLONG_MAX

externsignedlongFASTCALL（schedule_timeout（signedlongtimeout））;

asmlinkagevoidschedule（void）;

externintschedule_task（structtq_struct*task）;

externvoidflush_scheduled_tasks（void）;

externi

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