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陈一居

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ruanjiangongcheng 1 year ago
parent 2badff4e6d
commit ff517ec5e6
1 changed files with 115 additions and 110 deletions
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225
core/los_process.c
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@ -1,4 +1,9 @@
/* /*并发（Concurrent）:多个线程在单个核心运行，同一时间只能一个线程运行，内核不停切换线程，
看起来像同时运行，实际上是线程不停切换
并行（Parallel）每个线程分配给独立的CPU核心，线程同时运行
单核CPU多个进程或多个线程内能实现并发（微观上的串行，宏观上的并行）
多核CPU线程间可以实现宏观和微观上的并行
LITE_OS_SEC_BSS 和 LITE_OS_SEC_DATA_INIT 是告诉编译器这些全局变量放在哪个数据段
* Copyright (c) 2013-2019 Huawei Technologies Co., Ltd. All rights reserved. * Copyright (c) 2013-2019 Huawei Technologies Co., Ltd. All rights reserved.
* Copyright (c) 2020-2021 Huawei Device Co., Ltd. All rights reserved. * Copyright (c) 2020-2021 Huawei Device Co., Ltd. All rights reserved.
* *
@ -56,23 +61,23 @@
#include "los_vm_syscall.h" #include "los_vm_syscall.h"
LITE_OS_SEC_BSS LosProcessCB *g_processCBArray = NULL; LITE_OS_SEC_BSS LosProcessCB *g_processCBArray = NULL;///< 进程池数组
LITE_OS_SEC_DATA_INIT STATIC LOS_DL_LIST g_freeProcess; LITE_OS_SEC_DATA_INIT STATIC LOS_DL_LIST g_freeProcess;///< 空闲状态下的进程链表
LITE_OS_SEC_DATA_INIT STATIC LOS_DL_LIST g_processRecycleList; LITE_OS_SEC_DATA_INIT STATIC LOS_DL_LIST g_processRecycleList;///< 需要回收的进程列表
LITE_OS_SEC_BSS UINT32 g_userInitProcess = OS_INVALID_VALUE; LITE_OS_SEC_BSS UINT32 g_userInitProcess = OS_INVALID_VALUE;
LITE_OS_SEC_BSS UINT32 g_kernelInitProcess = OS_INVALID_VALUE; LITE_OS_SEC_BSS UINT32 g_kernelInitProcess = OS_INVALID_VALUE;
LITE_OS_SEC_BSS UINT32 g_kernelIdleProcess = OS_INVALID_VALUE; LITE_OS_SEC_BSS UINT32 g_kernelIdleProcess = OS_INVALID_VALUE;
LITE_OS_SEC_BSS UINT32 g_processMaxNum; LITE_OS_SEC_BSS UINT32 g_processMaxNum;///< 进程最大数量,默认64个
LITE_OS_SEC_BSS ProcessGroup *g_processGroup = NULL; LITE_OS_SEC_BSS ProcessGroup *g_processGroup = NULL;///< 全局进程组,负责管理所有进程组
//将进程插入到空闲的链表中//
STATIC INLINE VOID OsInsertPCBToFreeList(LosProcessCB *processCB) STATIC INLINE VOID OsInsertPCBToFreeList(LosProcessCB *processCB)
{ {
UINT32 pid = processCB->processID; UINT32 pid = processCB->processID;//获取进程ID
(VOID)memset_s(processCB, sizeof(LosProcessCB), 0, sizeof(LosProcessCB)); (VOID)memset_s(processCB, sizeof(LosProcessCB), 0, sizeof(LosProcessCB));//进程描述符数据清0
processCB->processID = pid; processCB->processID = pid;//进程ID
processCB->processStatus = OS_PROCESS_FLAG_UNUSED; processCB->processStatus = OS_PROCESS_FLAG_UNUSED;//设置为进程未使用
processCB->timerID = (timer_t)(UINTPTR)MAX_INVALID_TIMER_VID; processCB->timerID = (timer_t)(UINTPTR)MAX_INVALID_TIMER_VID;//timeID初始化值
LOS_ListTailInsert(&g_freeProcess, &processCB->pendList); LOS_ListTailInsert(&g_freeProcess, &processCB->pendList);//进程节点挂入g_freeProcess以分配给后续进程使用
} }
STATIC ProcessGroup *OsCreateProcessGroup(UINT32 pid) STATIC ProcessGroup *OsCreateProcessGroup(UINT32 pid)
@ -97,25 +102,25 @@ STATIC ProcessGroup *OsCreateProcessGroup(UINT32 pid)
return group; return group;
} }
/* 退出进程组,参数是进程地址和进程组地址的地址 */
STATIC VOID OsExitProcessGroup(LosProcessCB *processCB, ProcessGroup **group) STATIC VOID OsExitProcessGroup(LosProcessCB *processCB, ProcessGroup **group)
{ {
LosProcessCB *groupProcessCB = OS_PCB_FROM_PID(processCB->group->groupID); LosProcessCB *groupProcessCB = OS_PCB_FROM_PID(processCB->group->groupID);
LOS_ListDelete(&processCB->subordinateGroupList); LOS_ListDelete(&processCB->subordinateGroupList);//从进程组进程链表上摘出去
if (LOS_ListEmpty(&processCB->group->processList) && LOS_ListEmpty(&processCB->group->exitProcessList)) { if (LOS_ListEmpty(&processCB->group->processList) && LOS_ListEmpty(&processCB->group->exitProcessList)) {
LOS_ListDelete(&processCB->group->groupList); LOS_ListDelete(&processCB->group->groupList);
groupProcessCB->processStatus &= ~OS_PROCESS_FLAG_GROUP_LEADER; groupProcessCB->processStatus &= ~OS_PROCESS_FLAG_GROUP_LEADER;
*group = processCB->group; *group = processCB->group;
if (OsProcessIsUnused(groupProcessCB) && !(groupProcessCB->processStatus & OS_PROCESS_FLAG_EXIT)) { if (OsProcessIsUnused(groupProcessCB) && !(groupProcessCB->processStatus & OS_PROCESS_FLAG_EXIT)) {
LOS_ListDelete(&groupProcessCB->pendList); LOS_ListDelete(&groupProcessCB->pendList);//进程从全局进程链表上摘除
OsInsertPCBToFreeList(groupProcessCB); OsInsertPCBToFreeList(groupProcessCB);//释放进程的资源,回到freelist再利用
} }
} }
processCB->group = NULL; processCB->group = NULL;
} }
/*通过指定组ID找到进程组 */
STATIC ProcessGroup *OsFindProcessGroup(UINT32 gid) STATIC ProcessGroup *OsFindProcessGroup(UINT32 gid)
{ {
ProcessGroup *group = NULL; ProcessGroup *group = NULL;
@ -132,7 +137,7 @@ STATIC ProcessGroup *OsFindProcessGroup(UINT32 gid)
PRINT_INFO("%s is find group : %u failed!\n", __FUNCTION__, gid); PRINT_INFO("%s is find group : %u failed!\n", __FUNCTION__, gid);
return NULL; return NULL;
} }
/*给指定进程组发送信号 */
STATIC INT32 OsSendSignalToSpecifyProcessGroup(ProcessGroup *group, siginfo_t *info, INT32 permission) STATIC INT32 OsSendSignalToSpecifyProcessGroup(ProcessGroup *group, siginfo_t *info, INT32 permission)
{ {
INT32 ret, success, err; INT32 ret, success, err;
@ -152,7 +157,7 @@ STATIC INT32 OsSendSignalToSpecifyProcessGroup(ProcessGroup *group, siginfo_t *i
/* At least one success. */ /* At least one success. */
return success ? LOS_OK : ret; return success ? LOS_OK : ret;
} }
//创建进程组//
LITE_OS_SEC_TEXT INT32 OsSendSignalToAllProcess(siginfo_t *info, INT32 permission) LITE_OS_SEC_TEXT INT32 OsSendSignalToAllProcess(siginfo_t *info, INT32 permission)
{ {
INT32 ret, success, err; INT32 ret, success, err;
@ -232,7 +237,7 @@ STATIC LosProcessCB *OsFindExitChildProcess(const LosProcessCB *processCB, INT32
PRINT_INFO("%s is find the exit child : %d failed in parent : %u\n", __FUNCTION__, childPid, processCB->processID); PRINT_INFO("%s is find the exit child : %d failed in parent : %u\n", __FUNCTION__, childPid, processCB->processID);
return NULL; return NULL;
} }
/* 唤醒等待wakePID结束的任务 */
VOID OsWaitWakeTask(LosTaskCB *taskCB, UINT32 wakePID) VOID OsWaitWakeTask(LosTaskCB *taskCB, UINT32 wakePID)
{ {
taskCB->waitID = wakePID; taskCB->waitID = wakePID;
@ -241,7 +246,7 @@ VOID OsWaitWakeTask(LosTaskCB *taskCB, UINT32 wakePID)
LOS_MpSchedule(OS_MP_CPU_ALL); LOS_MpSchedule(OS_MP_CPU_ALL);
#endif #endif
} }
/* 唤醒等待参数进程结束的任务 */
STATIC BOOL OsWaitWakeSpecifiedProcess(LOS_DL_LIST *head, const LosProcessCB *processCB, LOS_DL_LIST **anyList) STATIC BOOL OsWaitWakeSpecifiedProcess(LOS_DL_LIST *head, const LosProcessCB *processCB, LOS_DL_LIST **anyList)
{ {
LOS_DL_LIST *list = head; LOS_DL_LIST *list = head;
@ -249,7 +254,7 @@ STATIC BOOL OsWaitWakeSpecifiedProcess(LOS_DL_LIST *head, const LosProcessCB *pr
UINT32 pid = 0; UINT32 pid = 0;
BOOL find = FALSE; BOOL find = FALSE;
while (list->pstNext != head) { while (list->pstNext != head) {//遍历等待链表 processCB->waitList
taskCB = OS_TCB_FROM_PENDLIST(LOS_DL_LIST_FIRST(list)); taskCB = OS_TCB_FROM_PENDLIST(LOS_DL_LIST_FIRST(list));
if ((taskCB->waitFlag == OS_PROCESS_WAIT_PRO) && (taskCB->waitID == processCB->processID)) { if ((taskCB->waitFlag == OS_PROCESS_WAIT_PRO) && (taskCB->waitID == processCB->processID)) {
if (pid == 0) { if (pid == 0) {
@ -259,7 +264,7 @@ STATIC BOOL OsWaitWakeSpecifiedProcess(LOS_DL_LIST *head, const LosProcessCB *pr
pid = OS_INVALID_VALUE; pid = OS_INVALID_VALUE;
} }
OsWaitWakeTask(taskCB, pid); OsWaitWakeTask(taskCB, pid);//唤醒这个任务,此时会切到 LOS_Wait runTask->waitFlag = 0;处运行
continue; continue;
} }
@ -272,7 +277,7 @@ STATIC BOOL OsWaitWakeSpecifiedProcess(LOS_DL_LIST *head, const LosProcessCB *pr
return find; return find;
} }
/* 检查父进程的等待任务并唤醒父进程去处理等待任务 */
STATIC VOID OsWaitCheckAndWakeParentProcess(LosProcessCB *parentCB, const LosProcessCB *processCB) STATIC VOID OsWaitCheckAndWakeParentProcess(LosProcessCB *parentCB, const LosProcessCB *processCB)
{ {
LOS_DL_LIST *head = &parentCB->waitList; LOS_DL_LIST *head = &parentCB->waitList;
@ -281,29 +286,29 @@ STATIC VOID OsWaitCheckAndWakeParentProcess(LosProcessCB *parentCB, const LosPro
BOOL findSpecified = FALSE; BOOL findSpecified = FALSE;
if (LOS_ListEmpty(&parentCB->waitList)) { if (LOS_ListEmpty(&parentCB->waitList)) {
return; return;//检查是否有正在等待子进程退出的任务，若没有则退出
} }
findSpecified = OsWaitWakeSpecifiedProcess(head, processCB, &list); findSpecified = OsWaitWakeSpecifiedProcess(head, processCB, &list);//找到指定的任务
if (findSpecified == TRUE) { if (findSpecified == TRUE) {
/* No thread is waiting for any child process to finish */ /* No thread is waiting for any child process to finish */
if (LOS_ListEmpty(&parentCB->waitList)) { if (LOS_ListEmpty(&parentCB->waitList)) {//没有线程正在等待任何子进程结束
return; return;
} else if (!LOS_ListEmpty(&parentCB->childrenList)) { } else if (!LOS_ListEmpty(&parentCB->childrenList)) {
/* Other child processes exist, and other threads that are waiting /* Other child processes exist, and other threads that are waiting
* for the child to finish continue to wait * for the child to finish continue to wait
*/ *///存在其他子进程，正在等待它们的子进程结束而将继续等待
return; return;
} }
} }
/* Waiting threads are waiting for a specified child process to finish */ /* Waiting threads are waiting for a specified child process to finish */
if (list == NULL) { if (list == NULL) {//等待线程正在等待指定的子进程结束
return; return;
} }
/* No child processes exist and all waiting threads are awakened */ /* No child processes exist and all waiting threads are awakened */
if (findSpecified == TRUE) { if (findSpecified == TRUE) {//所有等待的任务都唤醒
while (list->pstNext != head) { while (list->pstNext != head) {
taskCB = OS_TCB_FROM_PENDLIST(LOS_DL_LIST_FIRST(list)); taskCB = OS_TCB_FROM_PENDLIST(LOS_DL_LIST_FIRST(list));
OsWaitWakeTask(taskCB, OS_INVALID_VALUE); OsWaitWakeTask(taskCB, OS_INVALID_VALUE);
@ -311,7 +316,7 @@ STATIC VOID OsWaitCheckAndWakeParentProcess(LosProcessCB *parentCB, const LosPro
return; return;
} }
while (list->pstNext != head) { while (list->pstNext != head) {//处理 OS_PROCESS_WAIT_GID 标签
taskCB = OS_TCB_FROM_PENDLIST(LOS_DL_LIST_FIRST(list)); taskCB = OS_TCB_FROM_PENDLIST(LOS_DL_LIST_FIRST(list));
if (taskCB->waitFlag == OS_PROCESS_WAIT_GID) { if (taskCB->waitFlag == OS_PROCESS_WAIT_GID) {
if (taskCB->waitID != processCB->group->groupID) { if (taskCB->waitID != processCB->group->groupID) {
@ -334,7 +339,7 @@ STATIC VOID OsWaitCheckAndWakeParentProcess(LosProcessCB *parentCB, const LosPro
return; return;
} }
/* 回收指定进程的资源 */
LITE_OS_SEC_TEXT VOID OsProcessResourcesToFree(LosProcessCB *processCB) LITE_OS_SEC_TEXT VOID OsProcessResourcesToFree(LosProcessCB *processCB)
{ {
if (!(processCB->processStatus & (OS_PROCESS_STATUS_INIT | OS_PROCESS_STATUS_RUNNING))) { if (!(processCB->processStatus & (OS_PROCESS_STATUS_INIT | OS_PROCESS_STATUS_RUNNING))) {
@ -351,8 +356,8 @@ LITE_OS_SEC_TEXT VOID OsProcessResourcesToFree(LosProcessCB *processCB)
#ifdef LOSCFG_SECURITY_CAPABILITY #ifdef LOSCFG_SECURITY_CAPABILITY
if (processCB->user != NULL) { if (processCB->user != NULL) {
(VOID)LOS_MemFree(m_aucSysMem1, processCB->user); (VOID)LOS_MemFree(m_aucSysMem1, processCB->user);//删除用户
processCB->user = NULL; processCB->user = NULL;//重置指针为空
} }
#endif #endif
@ -376,23 +381,23 @@ LITE_OS_SEC_TEXT VOID OsProcessResourcesToFree(LosProcessCB *processCB)
LITE_OS_SEC_TEXT STATIC VOID OsRecycleZombiesProcess(LosProcessCB *childCB, ProcessGroup **group) LITE_OS_SEC_TEXT STATIC VOID OsRecycleZombiesProcess(LosProcessCB *childCB, ProcessGroup **group)
{ {
OsExitProcessGroup(childCB, group); OsExitProcessGroup(childCB, group);//退出进程组
LOS_ListDelete(&childCB->siblingList); LOS_ListDelete(&childCB->siblingList);//从父亲大人的子孙链表上摘除
if (childCB->processStatus & OS_PROCESS_STATUS_ZOMBIES) { if (childCB->processStatus & OS_PROCESS_STATUS_ZOMBIES) {
childCB->processStatus &= ~OS_PROCESS_STATUS_ZOMBIES; childCB->processStatus &= ~OS_PROCESS_STATUS_ZOMBIES;//去掉僵死标签
childCB->processStatus |= OS_PROCESS_FLAG_UNUSED; childCB->processStatus |= OS_PROCESS_FLAG_UNUSED;//贴上没使用标签，进程由进程池分配，进程退出后重新回到空闲进程池
} }
LOS_ListDelete(&childCB->pendList); LOS_ListDelete(&childCB->pendList);//将自己从阻塞链表上摘除
if (childCB->processStatus & OS_PROCESS_FLAG_EXIT) { if (childCB->processStatus & OS_PROCESS_FLAG_EXIT) {
LOS_ListHeadInsert(&g_processRecycleList, &childCB->pendList); LOS_ListHeadInsert(&g_processRecycleList, &childCB->pendList);//从头部插入，注意g_processRecyleList挂的是pendList节点,所以要通过OS_PCB_FROM_PENDLIST找.
} else if (childCB->processStatus & OS_PROCESS_FLAG_GROUP_LEADER) { } else if (childCB->processStatus & OS_PROCESS_FLAG_GROUP_LEADER) {
LOS_ListTailInsert(&g_processRecycleList, &childCB->pendList); LOS_ListTailInsert(&g_processRecycleList, &childCB->pendList);//从尾部插入
} else { } else {
OsInsertPCBToFreeList(childCB); OsInsertPCBToFreeList(childCB);//直接插到freeList中去，可用于重新分配了。
} }
} }
/*! 当一个进程自然退出的时候,它的孩子进程由两位老祖宗收养 */
STATIC VOID OsDealAliveChildProcess(LosProcessCB *processCB) STATIC VOID OsDealAliveChildProcess(LosProcessCB *processCB)
{ {
UINT32 parentID; UINT32 parentID;
@ -401,20 +406,20 @@ STATIC VOID OsDealAliveChildProcess(LosProcessCB *processCB)
LOS_DL_LIST *nextList = NULL; LOS_DL_LIST *nextList = NULL;
LOS_DL_LIST *childHead = NULL; LOS_DL_LIST *childHead = NULL;
if (!LOS_ListEmpty(&processCB->childrenList)) { if (!LOS_ListEmpty(&processCB->childrenList)) {//如果存在孩子进程
childHead = processCB->childrenList.pstNext; childHead = processCB->childrenList.pstNext;//获取孩子链表
LOS_ListDelete(&(processCB->childrenList)); LOS_ListDelete(&(processCB->childrenList));//清空自己的孩子链表
if (OsProcessIsUserMode(processCB)) { if (OsProcessIsUserMode(processCB)) {//是用户态进程
parentID = g_userInitProcess; parentID = g_userInitProcess;
} else { } else {
parentID = g_kernelInitProcess; parentID = g_kernelInitProcess;
} }
for (nextList = childHead; ;) { for (nextList = childHead; ;) {//遍历孩子链表
childCB = OS_PCB_FROM_SIBLIST(nextList); childCB = OS_PCB_FROM_SIBLIST(nextList);//找到孩子的真身//找到孩子的真身
childCB->parentProcessID = parentID; childCB->parentProcessID = parentID;
nextList = nextList->pstNext; nextList = nextList->pstNext;//找下一个孩子进程
if (nextList == childHead) { if (nextList == childHead) {//所以孩子都完成操作
break; break;
} }
} }
@ -425,22 +430,23 @@ STATIC VOID OsDealAliveChildProcess(LosProcessCB *processCB)
return; return;
} }
/*! 回收指定进程的已经退出的孩子进程所占资源 */
STATIC VOID OsChildProcessResourcesFree(const LosProcessCB *processCB) STATIC VOID OsChildProcessResourcesFree(const LosProcessCB *processCB)
{ {
LosProcessCB *childCB = NULL; LosProcessCB *childCB = NULL;
ProcessGroup *group = NULL; ProcessGroup *group = NULL;
while (!LOS_ListEmpty(&((LosProcessCB *)processCB)->exitChildList)) { while (!LOS_ListEmpty(&((LosProcessCB *)processCB)->exitChildList)) {//遍历直到没有了退出的孩子进程
childCB = LOS_DL_LIST_ENTRY(processCB->exitChildList.pstNext, LosProcessCB, siblingList); childCB = LOS_DL_LIST_ENTRY(processCB->exitChildList.pstNext, LosProcessCB, siblingList);//获取孩子进程
OsRecycleZombiesProcess(childCB, &group); OsRecycleZombiesProcess(childCB, &group);//其中会将childCB从exitChildList链表上摘出去
(VOID)LOS_MemFree(m_aucSysMem1, group); (VOID)LOS_MemFree(m_aucSysMem1, group);
} }
} }
STATIC VOID OsProcessNaturalExit(LosTaskCB *runTask, UINT32 status) STATIC VOID OsProcessNaturalExit(LosTaskCB *runTask, UINT32 status)
{ {
LosProcessCB *processCB = OS_PCB_FROM_PID(runTask->processID); LosProcessCB *processCB = OS_PCB_FROM_PID(runTask->processID);//释放孩子进程的资源
LosProcessCB *parentCB = NULL; LosProcessCB *parentCB = NULL;
LOS_ASSERT(processCB->processStatus & OS_PROCESS_STATUS_RUNNING); LOS_ASSERT(processCB->processStatus & OS_PROCESS_STATUS_RUNNING);
@ -475,26 +481,26 @@ STATIC VOID OsProcessNaturalExit(LosTaskCB *runTask, UINT32 status)
LOS_Panic("pid : %u is the root process exit!\n", processCB->processID); LOS_Panic("pid : %u is the root process exit!\n", processCB->processID);
return; return;
} }
/*! 进程模块初始化,被编译放在代码段 .init 中*/
STATIC UINT32 OsProcessInit(VOID) STATIC UINT32 OsProcessInit(VOID)
{ {
UINT32 index; UINT32 index;
UINT32 size; UINT32 size;
g_processMaxNum = LOSCFG_BASE_CORE_PROCESS_LIMIT; g_processMaxNum = LOSCFG_BASE_CORE_PROCESS_LIMIT;//默认支持64个进程
size = g_processMaxNum * sizeof(LosProcessCB); size = g_processMaxNum * sizeof(LosProcessCB);
g_processCBArray = (LosProcessCB *)LOS_MemAlloc(m_aucSysMem1, size); g_processCBArray = (LosProcessCB *)LOS_MemAlloc(m_aucSysMem1, size);// 进程池，占用内核堆,内存池分配
if (g_processCBArray == NULL) { if (g_processCBArray == NULL) {
return LOS_NOK; return LOS_NOK;
} }
(VOID)memset_s(g_processCBArray, size, 0, size); (VOID)memset_s(g_processCBArray, size, 0, size);//安全方式重置清0
LOS_ListInit(&g_freeProcess); LOS_ListInit(&g_freeProcess);//进程空闲链表初始化，创建一个进程时从g_freeProcess中申请一个进程描述符使用
LOS_ListInit(&g_processRecycleList); LOS_ListInit(&g_processRecycleList);//进程回收链表初始化,回收完成后进入g_freeProcess等待再次被申请使用
for (index = 0; index < g_processMaxNum; index++) { for (index = 0; index < g_processMaxNum; index++) {//进程池循环创建
g_processCBArray[index].processID = index; g_processCBArray[index].processID = index;//进程ID[0-g_processMaxNum-1]赋值
g_processCBArray[index].processStatus = OS_PROCESS_FLAG_UNUSED; g_processCBArray[index].processStatus = OS_PROCESS_FLAG_UNUSED;
LOS_ListTailInsert(&g_freeProcess, &g_processCBArray[index].pendList); LOS_ListTailInsert(&g_freeProcess, &g_processCBArray[index].pendList);
} }
@ -510,16 +516,16 @@ STATIC UINT32 OsProcessInit(VOID)
return LOS_OK; return LOS_OK;
} }
/*! 进程回收再利用过程*/
LITE_OS_SEC_TEXT VOID OsProcessCBRecycleToFree(VOID) LITE_OS_SEC_TEXT VOID OsProcessCBRecycleToFree(VOID)
{ {
UINT32 intSave; UINT32 intSave;
LosProcessCB *processCB = NULL; LosProcessCB *processCB = NULL;
SCHEDULER_LOCK(intSave); SCHEDULER_LOCK(intSave);
while (!LOS_ListEmpty(&g_processRecycleList)) { while (!LOS_ListEmpty(&g_processRecycleList)) {//循环任务回收链表,直到为空
processCB = OS_PCB_FROM_PENDLIST(LOS_DL_LIST_FIRST(&g_processRecycleList)); processCB = OS_PCB_FROM_PENDLIST(LOS_DL_LIST_FIRST(&g_processRecycleList));
if (!(processCB->processStatus & OS_PROCESS_FLAG_EXIT)) { if (!(processCB->processStatus & OS_PROCESS_FLAG_EXIT)) {//进程没有退出标签
break; break;
} }
SCHEDULER_UNLOCK(intSave); SCHEDULER_UNLOCK(intSave);
@ -530,32 +536,32 @@ LITE_OS_SEC_TEXT VOID OsProcessCBRecycleToFree(VOID)
processCB->processStatus &= ~OS_PROCESS_FLAG_EXIT; processCB->processStatus &= ~OS_PROCESS_FLAG_EXIT;
#ifdef LOSCFG_KERNEL_VM #ifdef LOSCFG_KERNEL_VM
LosVmSpace *space = NULL; LosVmSpace *space = NULL;
if (OsProcessIsUserMode(processCB)) { if (OsProcessIsUserMode(processCB)) {//进程是否是用户态进程
space = processCB->vmSpace; space = processCB->vmSpace;//只有用户态的进程才需要释放虚拟内存空间
} }
processCB->vmSpace = NULL; processCB->vmSpace = NULL;
#endif #endif
/* OS_PROCESS_FLAG_GROUP_LEADER: The lead process group cannot be recycled without destroying the PCB. /* OS_PROCESS_FLAG_GROUP_LEADER: The lead process group cannot be recycled without destroying the PCB.
* !OS_PROCESS_FLAG_UNUSED: Parent process does not reclaim child process resources. * !OS_PROCESS_FLAG_UNUSED: Parent process does not reclaim child process resources.
*/ */
LOS_ListDelete(&processCB->pendList); LOS_ListDelete(&processCB->pendList);//将进程从进程链表上摘除
if ((processCB->processStatus & OS_PROCESS_FLAG_GROUP_LEADER) || if ((processCB->processStatus & OS_PROCESS_FLAG_GROUP_LEADER) ||
(processCB->processStatus & OS_PROCESS_STATUS_ZOMBIES)) { (processCB->processStatus & OS_PROCESS_STATUS_ZOMBIES)) {
LOS_ListTailInsert(&g_processRecycleList, &processCB->pendList); LOS_ListTailInsert(&g_processRecycleList, &processCB->pendList);//将进程挂到进程回收链表上,
} else { } else {
/* Clear the bottom 4 bits of process status */ /* Clear the bottom 4 bits of process status */
OsInsertPCBToFreeList(processCB); OsInsertPCBToFreeList(processCB);//进程回到可分配池中,再分配利用
} }
SCHEDULER_UNLOCK(intSave); SCHEDULER_UNLOCK(intSave);
#ifdef LOSCFG_KERNEL_VM #ifdef LOSCFG_KERNEL_VM
(VOID)LOS_VmSpaceFree(space); (VOID)LOS_VmSpaceFree(space);//释放用户态进程的虚拟内存空间,因为内核只有一个虚拟空间,因此不需要释放虚拟空间.
#endif #endif
SCHEDULER_LOCK(intSave); SCHEDULER_LOCK(intSave);
} }
SCHEDULER_UNLOCK(intSave); SCHEDULER_UNLOCK(intSave);
} }
/*! 删除PCB块 其实是 PCB块回归进程池,先进入回收链表*/
STATIC VOID OsDeInitPCB(LosProcessCB *processCB) STATIC VOID OsDeInitPCB(LosProcessCB *processCB)
{ {
UINT32 intSave; UINT32 intSave;
@ -565,11 +571,11 @@ STATIC VOID OsDeInitPCB(LosProcessCB *processCB)
return; return;
} }
OsProcessResourcesToFree(processCB); OsProcessResourcesToFree(processCB);//释放进程所占用的资源
SCHEDULER_LOCK(intSave); SCHEDULER_LOCK(intSave);
if (processCB->parentProcessID != OS_INVALID_VALUE) { if (processCB->parentProcessID != OS_INVALID_VALUE) {
LOS_ListDelete(&processCB->siblingList); LOS_ListDelete(&processCB->siblingList);//将进程从兄弟链表中摘除
processCB->parentProcessID = OS_INVALID_VALUE; processCB->parentProcessID = OS_INVALID_VALUE;
} }
@ -577,8 +583,8 @@ STATIC VOID OsDeInitPCB(LosProcessCB *processCB)
OsExitProcessGroup(processCB, &group); OsExitProcessGroup(processCB, &group);
} }
processCB->processStatus &= ~OS_PROCESS_STATUS_INIT; processCB->processStatus &= ~OS_PROCESS_STATUS_INIT;//设置进程状态为非初始化
processCB->processStatus |= OS_PROCESS_FLAG_EXIT; processCB->processStatus |= OS_PROCESS_FLAG_EXIT;//设置进程状态为退出
LOS_ListHeadInsert(&g_processRecycleList, &processCB->pendList); LOS_ListHeadInsert(&g_processRecycleList, &processCB->pendList);
SCHEDULER_UNLOCK(intSave); SCHEDULER_UNLOCK(intSave);
@ -586,7 +592,7 @@ STATIC VOID OsDeInitPCB(LosProcessCB *processCB)
OsWriteResourceEvent(OS_RESOURCE_EVENT_FREE); OsWriteResourceEvent(OS_RESOURCE_EVENT_FREE);
return; return;
} }
/*! 设置进程的名字*/
UINT32 OsSetProcessName(LosProcessCB *processCB, const CHAR *name) UINT32 OsSetProcessName(LosProcessCB *processCB, const CHAR *name)
{ {
errno_t errRet; errno_t errRet;
@ -618,29 +624,28 @@ UINT32 OsSetProcessName(LosProcessCB *processCB, const CHAR *name)
} }
return LOS_OK; return LOS_OK;
} }
/*! 初始化PCB(进程控制块)*/
STATIC UINT32 OsInitPCB(LosProcessCB *processCB, UINT32 mode, UINT16 priority, const CHAR *name) STATIC UINT32 OsInitPCB(LosProcessCB *processCB, UINT32 mode, UINT16 priority, const CHAR *name)
{ {
processCB->processMode = mode; processCB->processMode = mode; //用户态进程还是内核态进程
processCB->processStatus = OS_PROCESS_STATUS_INIT; processCB->processStatus = OS_PROCESS_STATUS_INIT; //进程初始状态
processCB->parentProcessID = OS_INVALID_VALUE; processCB->parentProcess = NULL;
processCB->threadGroupID = OS_INVALID_VALUE; processCB->threadGroup = NULL;
processCB->priority = priority; processCB->umask = OS_PROCESS_DEFAULT_UMASK; //掩码
processCB->umask = OS_PROCESS_DEFAULT_UMASK;
processCB->timerID = (timer_t)(UINTPTR)MAX_INVALID_TIMER_VID; processCB->timerID = (timer_t)(UINTPTR)MAX_INVALID_TIMER_VID;
LOS_ListInit(&processCB->threadSiblingList); LOS_ListInit(&processCB->threadSiblingList);//初始化孩子任务/线程链表，上面挂的都是由此fork的孩子线程 见于 OsTaskCBInit LOS_ListTailInsert(&(processCB->threadSiblingList), &(taskCB->threadList));
LOS_ListInit(&processCB->childrenList); LOS_ListInit(&processCB->childrenList); //初始化孩子进程链表，上面挂的都是由此fork的孩子进程 见于 OsCopyParent LOS_ListTailInsert(&parentProcessCB->childrenList, &childProcessCB->siblingList);
LOS_ListInit(&processCB->exitChildList); LOS_ListInit(&processCB->exitChildList); //初始化记录退出孩子进程链表，上面挂的是哪些exit 见于 OsProcessNaturalExit LOS_ListTailInsert(&parentCB->exitChildList, &processCB->siblingList);
LOS_ListInit(&(processCB->waitList)); LOS_ListInit(&(processCB->waitList)); //初始化等待任务链表 上面挂的是处于等待的 见于 OsWaitInsertWaitLIstInOrder LOS_ListHeadInsert(&processCB->waitList, &runTask->pendList);
#ifdef LOSCFG_KERNEL_VM #ifdef LOSCFG_KERNEL_VM
if (OsProcessIsUserMode(processCB)) { if (OsProcessIsUserMode(processCB)) {//如果是用户态进程
processCB->vmSpace = OsCreateUserVmSpace(); processCB->vmSpace = OsCreateUserVmSpace();//创建用户空间
if (processCB->vmSpace == NULL) { if (processCB->vmSpace == NULL) {
processCB->processStatus = OS_PROCESS_FLAG_UNUSED; processCB->processStatus = OS_PROCESS_FLAG_UNUSED;
return LOS_ENOMEM; return LOS_ENOMEM;
} }//在鸿蒙内核态进程只有kprocess 和 kidle 两个
} else { } else {
processCB->vmSpace = LOS_GetKVmSpace(); processCB->vmSpace = LOS_GetKVmSpace();
} }
@ -653,7 +658,7 @@ STATIC UINT32 OsInitPCB(LosProcessCB *processCB, UINT32 mode, UINT16 priority, c
} }
#endif #endif
#ifdef LOSCFG_SECURITY_CAPABILITY #ifdef LOSCFG_SECURITY_CAPABILITY
OsInitCapability(processCB); OsInitCapability(processCB);//初始化进程安全相关功能
#endif #endif
if (OsSetProcessName(processCB, name) != LOS_OK) { if (OsSetProcessName(processCB, name) != LOS_OK) {
@ -662,10 +667,10 @@ STATIC UINT32 OsInitPCB(LosProcessCB *processCB, UINT32 mode, UINT16 priority, c
return LOS_OK; return LOS_OK;
} }
//创建用户
#ifdef LOSCFG_SECURITY_CAPABILITY #ifdef LOSCFG_SECURITY_CAPABILITY
STATIC User *OsCreateUser(UINT32 userID, UINT32 gid, UINT32 size) STATIC User *OsCreateUser(UINT32 userID, UINT32 gid, UINT32 size)//参数size 表示组数量
{ { //(size - 1) * sizeof(UINT32) 用于 user->groups[..],这种设计节约了内存,不造成不需要的浪费
User *user = LOS_MemAlloc(m_aucSysMem1, sizeof(User) + (size - 1) * sizeof(UINT32)); User *user = LOS_MemAlloc(m_aucSysMem1, sizeof(User) + (size - 1) * sizeof(UINT32));
if (user == NULL) { if (user == NULL) {
return NULL; return NULL;
@ -675,11 +680,11 @@ STATIC User *OsCreateUser(UINT32 userID, UINT32 gid, UINT32 size)
user->effUserID = userID; user->effUserID = userID;
user->gid = gid; user->gid = gid;
user->effGid = gid; user->effGid = gid;
user->groupNumber = size; user->groupNumber = size;//用户组数量
user->groups[0] = gid; user->groups[0] = gid; //用户组列表,一个用户可以属于多个用户组
return user; return user;
} }
/*! 检查参数群组ID是否在当前用户所属群组中*/
LITE_OS_SEC_TEXT BOOL LOS_CheckInGroups(UINT32 gid) LITE_OS_SEC_TEXT BOOL LOS_CheckInGroups(UINT32 gid)
{ {
UINT32 intSave; UINT32 intSave;
@ -687,8 +692,8 @@ LITE_OS_SEC_TEXT BOOL LOS_CheckInGroups(UINT32 gid)
User *user = NULL; User *user = NULL;
SCHEDULER_LOCK(intSave); SCHEDULER_LOCK(intSave);
user = OsCurrUserGet(); user = OsCurrUserGet();//当前进程所属用户
for (count = 0; count < user->groupNumber; count++) { for (count = 0; count < user->groupNumber; count++) {//循环对比
if (user->groups[count] == gid) { if (user->groups[count] == gid) {
SCHEDULER_UNLOCK(intSave); SCHEDULER_UNLOCK(intSave);
return TRUE; return TRUE;
@ -699,7 +704,7 @@ LITE_OS_SEC_TEXT BOOL LOS_CheckInGroups(UINT32 gid)
return FALSE; return FALSE;
} }
#endif #endif
/*! 获取当前进程的用户ID*/
LITE_OS_SEC_TEXT INT32 LOS_GetUserID(VOID) LITE_OS_SEC_TEXT INT32 LOS_GetUserID(VOID)
{ {
#ifdef LOSCFG_SECURITY_CAPABILITY #ifdef LOSCFG_SECURITY_CAPABILITY
@ -714,7 +719,7 @@ LITE_OS_SEC_TEXT INT32 LOS_GetUserID(VOID)
return 0; return 0;
#endif #endif
} }
/*! 获取当前进程的用户组ID*/
LITE_OS_SEC_TEXT INT32 LOS_GetGroupID(VOID) LITE_OS_SEC_TEXT INT32 LOS_GetGroupID(VOID)
{ {
#ifdef LOSCFG_SECURITY_CAPABILITY #ifdef LOSCFG_SECURITY_CAPABILITY
@ -730,7 +735,7 @@ LITE_OS_SEC_TEXT INT32 LOS_GetGroupID(VOID)
return 0; return 0;
#endif #endif
} }
/*! 进程创建初始化*/
STATIC UINT32 OsProcessCreateInit(LosProcessCB *processCB, UINT32 flags, const CHAR *name, UINT16 priority) STATIC UINT32 OsProcessCreateInit(LosProcessCB *processCB, UINT32 flags, const CHAR *name, UINT16 priority)
{ {
ProcessGroup *group = NULL; ProcessGroup *group = NULL;
@ -777,7 +782,7 @@ EXIT:
OsDeInitPCB(processCB); OsDeInitPCB(processCB);
return ret; return ret;
} }
/*! 创建2,0号进程,即内核态进程的老祖宗*/
LITE_OS_SEC_TEXT_INIT UINT32 OsSystemProcessCreate(VOID) LITE_OS_SEC_TEXT_INIT UINT32 OsSystemProcessCreate(VOID)
{ {
UINT32 ret = OsProcessInit(); UINT32 ret = OsProcessInit();
@ -791,13 +796,13 @@ LITE_OS_SEC_TEXT_INIT UINT32 OsSystemProcessCreate(VOID)
return ret; return ret;
} }
kerInitProcess->processStatus &= ~OS_PROCESS_STATUS_INIT; kerInitProcess->processStatus &= ~OS_PROCESS_STATUS_INIT;//去掉初始化标签
g_processGroup = kerInitProcess->group; g_processGroup = kerInitProcess->group;
LOS_ListInit(&g_processGroup->groupList); LOS_ListInit(&g_processGroup->groupList);
OsCurrProcessSet(kerInitProcess); OsCurrProcessSet(kerInitProcess);
LosProcessCB *idleProcess = OS_PCB_FROM_PID(g_kernelIdleProcess); LosProcessCB *idleProcess = OS_PCB_FROM_PID(g_kernelIdleProcess);
ret = OsInitPCB(idleProcess, OS_KERNEL_MODE, OS_TASK_PRIORITY_LOWEST, "KIdle"); ret = OsInitPCB(idleProcess, OS_KERNEL_MODE, OS_TASK_PRIORITY_LOWEST, "KIdle");//创建内核态0号进程
if (ret != LOS_OK) { if (ret != LOS_OK) {
return ret; return ret;
} }
@ -820,7 +825,7 @@ LITE_OS_SEC_TEXT_INIT UINT32 OsSystemProcessCreate(VOID)
return LOS_OK; return LOS_OK;
} }
/// 进程调度参数检查
STATIC INLINE INT32 OsProcessSchedlerParamCheck(INT32 which, INT32 pid, UINT16 prio, UINT16 policy) STATIC INLINE INT32 OsProcessSchedlerParamCheck(INT32 which, INT32 pid, UINT16 prio, UINT16 policy)
{ {
if (OS_PID_CHECK_INVALID(pid)) { if (OS_PID_CHECK_INVALID(pid)) {

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