陈一居

1 year ago · ff517ec5e6
parent 2badff4e6d
commit ff517ec5e6
1 changed files with 115 additions and 110 deletions
--- a/core/los_process.c
+++ b/core/los_process.c
@ -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) 2020-2021 Huawei Device Co., Ltd. All rights reserved.
 *
@ -56,23 +61,23 @@
 #include "los_vm_syscall.h"


-LITE_OS_SEC_BSS LosProcessCB *g_processCBArray = NULL;
-LITE_OS_SEC_DATA_INIT STATIC LOS_DL_LIST g_freeProcess;
-LITE_OS_SEC_DATA_INIT STATIC LOS_DL_LIST g_processRecycleList;
+LITE_OS_SEC_BSS LosProcessCB *g_processCBArray = NULL;///< 进程池数组
+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;///< 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_kernelInitProcess = OS_INVALID_VALUE;
 LITE_OS_SEC_BSS UINT32 g_kernelIdleProcess = OS_INVALID_VALUE;
-LITE_OS_SEC_BSS UINT32 g_processMaxNum;
-LITE_OS_SEC_BSS ProcessGroup *g_processGroup = NULL;
-
+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;///< 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)
 {
-    UINT32 pid = processCB->processID;
-    (VOID)memset_s(processCB, sizeof(LosProcessCB), 0, sizeof(LosProcessCB));
-    processCB->processID = pid;
-    processCB->processStatus = OS_PROCESS_FLAG_UNUSED;
-    processCB->timerID = (timer_t)(UINTPTR)MAX_INVALID_TIMER_VID;
-    LOS_ListTailInsert(&g_freeProcess, &processCB->pendList);
+    UINT32 pid = processCB->processID;//获取进程ID
+    (VOID)memset_s(processCB, sizeof(LosProcessCB), 0, sizeof(LosProcessCB));//进程描述符数据清0
+    processCB->processID = pid;//进程ID
+    processCB->processStatus = OS_PROCESS_FLAG_UNUSED;//设置为进程未使用
+    processCB->timerID = (timer_t)(UINTPTR)MAX_INVALID_TIMER_VID;//timeID初始化值
+    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)
@ -97,25 +102,25 @@ STATIC ProcessGroup *OsCreateProcessGroup(UINT32 pid)

    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)
 {
    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)) {
        LOS_ListDelete(&processCB->group->groupList);
        groupProcessCB->processStatus &= ~OS_PROCESS_FLAG_GROUP_LEADER;
        *group = processCB->group;
        if (OsProcessIsUnused(groupProcessCB) && !(groupProcessCB->processStatus & OS_PROCESS_FLAG_EXIT)) {
-            LOS_ListDelete(&groupProcessCB->pendList);
-            OsInsertPCBToFreeList(groupProcessCB);
+            LOS_ListDelete(&groupProcessCB->pendList);//进程从全局进程链表上摘除
+            OsInsertPCBToFreeList(groupProcessCB);//释放进程的资源,回到freelist再利用
        }
    }

    processCB->group = NULL;
 }
-
+/*通过指定组ID找到进程组 */
 STATIC ProcessGroup *OsFindProcessGroup(UINT32 gid)
 {
    ProcessGroup *group = NULL;
@ -132,7 +137,7 @@ STATIC ProcessGroup *OsFindProcessGroup(UINT32 gid)
    PRINT_INFO("%s is find group : %u failed!\n", __FUNCTION__, gid);
    return NULL;
 }
-
+/*给指定进程组发送信号 */
 STATIC INT32 OsSendSignalToSpecifyProcessGroup(ProcessGroup *group, siginfo_t *info, INT32 permission)
 {
    INT32 ret, success, err;
@ -152,7 +157,7 @@ STATIC INT32 OsSendSignalToSpecifyProcessGroup(ProcessGroup *group, siginfo_t *i
    /* At least one success. */
    return success ? LOS_OK : ret;
 }
-
+//创建进程组//
 LITE_OS_SEC_TEXT INT32 OsSendSignalToAllProcess(siginfo_t *info, INT32 permission)
 {
    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);
    return NULL;
 }
-
+/* 唤醒等待wakePID结束的任务 */
 VOID OsWaitWakeTask(LosTaskCB *taskCB, UINT32 wakePID)
 {
    taskCB->waitID = wakePID;
@ -241,7 +246,7 @@ VOID OsWaitWakeTask(LosTaskCB *taskCB, UINT32 wakePID)
    LOS_MpSchedule(OS_MP_CPU_ALL);
 #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)
 {
    LOS_DL_LIST *list = head;
@ -249,7 +254,7 @@ STATIC BOOL OsWaitWakeSpecifiedProcess(LOS_DL_LIST *head, const LosProcessCB *pr
    UINT32 pid = 0;
    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));
        if ((taskCB->waitFlag == OS_PROCESS_WAIT_PRO) && (taskCB->waitID == processCB->processID)) {
            if (pid == 0) {
@ -259,7 +264,7 @@ STATIC BOOL OsWaitWakeSpecifiedProcess(LOS_DL_LIST *head, const LosProcessCB *pr
                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;
        }

@ -272,7 +277,7 @@ STATIC BOOL OsWaitWakeSpecifiedProcess(LOS_DL_LIST *head, const LosProcessCB *pr

    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)
 {
    LOS_DL_LIST *head = &parentCB->waitList;
@ -281,29 +286,29 @@ STATIC VOID OsWaitCheckAndWakeParentProcess(LosProcessCB *parentCB, const LosPro
    BOOL findSpecified = FALSE;

    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) {
        /* 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;
        } else if (!LOS_ListEmpty(&parentCB->childrenList)) {
            /* Other child processes exist, and other threads that are waiting
             * 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;
        }
    }

    /* 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;
    }

    /* 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) {
            taskCB = OS_TCB_FROM_PENDLIST(LOS_DL_LIST_FIRST(list));
            OsWaitWakeTask(taskCB, OS_INVALID_VALUE);
@ -311,7 +316,7 @@ STATIC VOID OsWaitCheckAndWakeParentProcess(LosProcessCB *parentCB, const LosPro
        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));
        if (taskCB->waitFlag == OS_PROCESS_WAIT_GID) {
            if (taskCB->waitID != processCB->group->groupID) {
@ -334,7 +339,7 @@ STATIC VOID OsWaitCheckAndWakeParentProcess(LosProcessCB *parentCB, const LosPro

    return;
 }
-
+/* 回收指定进程的资源 */
 LITE_OS_SEC_TEXT VOID OsProcessResourcesToFree(LosProcessCB *processCB)
 {
    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
    if (processCB->user != NULL) {
-        (VOID)LOS_MemFree(m_aucSysMem1, processCB->user);
-        processCB->user = NULL;
+        (VOID)LOS_MemFree(m_aucSysMem1, processCB->user);//删除用户
+        processCB->user = NULL;//重置指针为空
    }
 #endif

@ -376,23 +381,23 @@ LITE_OS_SEC_TEXT VOID OsProcessResourcesToFree(LosProcessCB *processCB)

 LITE_OS_SEC_TEXT STATIC VOID OsRecycleZombiesProcess(LosProcessCB *childCB, ProcessGroup **group)
 {
-    OsExitProcessGroup(childCB, group);
-    LOS_ListDelete(&childCB->siblingList);
+    OsExitProcessGroup(childCB, group);//退出进程组
+    LOS_ListDelete(&childCB->siblingList);//从父亲大人的子孙链表上摘除
    if (childCB->processStatus & OS_PROCESS_STATUS_ZOMBIES) {
-        childCB->processStatus &= ~OS_PROCESS_STATUS_ZOMBIES;
-        childCB->processStatus |= OS_PROCESS_FLAG_UNUSED;
+        childCB->processStatus &= ~OS_PROCESS_STATUS_ZOMBIES;//去掉僵死标签
+        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) {
-        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) {
-        LOS_ListTailInsert(&g_processRecycleList, &childCB->pendList);
+        LOS_ListTailInsert(&g_processRecycleList, &childCB->pendList);//从尾部插入
    } 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)
 {
    UINT32 parentID;
@ -401,20 +406,20 @@ STATIC VOID OsDealAliveChildProcess(LosProcessCB *processCB)
    LOS_DL_LIST *nextList = NULL;
    LOS_DL_LIST *childHead = NULL;

-    if (!LOS_ListEmpty(&processCB->childrenList)) {
-        childHead = processCB->childrenList.pstNext;
-        LOS_ListDelete(&(processCB->childrenList));
-        if (OsProcessIsUserMode(processCB)) {
+    if (!LOS_ListEmpty(&processCB->childrenList)) {//如果存在孩子进程
+        childHead = processCB->childrenList.pstNext;//获取孩子链表
+        LOS_ListDelete(&(processCB->childrenList));//清空自己的孩子链表
+        if (OsProcessIsUserMode(processCB)) {//是用户态进程
            parentID = g_userInitProcess;
        } else {
            parentID = g_kernelInitProcess;
        }

-        for (nextList = childHead; ;) {
-            childCB = OS_PCB_FROM_SIBLIST(nextList);
+        for (nextList = childHead; ;) {//遍历孩子链表
+            childCB = OS_PCB_FROM_SIBLIST(nextList);//找到孩子的真身//找到孩子的真身
            childCB->parentProcessID = parentID;
-            nextList = nextList->pstNext;
-            if (nextList == childHead) {
+            nextList = nextList->pstNext;//找下一个孩子进程
+            if (nextList == childHead) {//所以孩子都完成操作
                break;
            }
        }
@ -425,22 +430,23 @@ STATIC VOID OsDealAliveChildProcess(LosProcessCB *processCB)

    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)
 {
    LosProcessCB *childCB = NULL;
    ProcessGroup *group = NULL;

-    while (!LOS_ListEmpty(&((LosProcessCB *)processCB)->exitChildList)) {
-        childCB = LOS_DL_LIST_ENTRY(processCB->exitChildList.pstNext, LosProcessCB, siblingList);
-        OsRecycleZombiesProcess(childCB, &group);
+    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);//获取孩子进程
+        OsRecycleZombiesProcess(childCB, &group);//其中会将childCB从exitChildList链表上摘出去
        (VOID)LOS_MemFree(m_aucSysMem1, group);
    }
 }

 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;

    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);
    return;
 }
-
+/*! 进程模块初始化,被编译放在代码段 .init 中*/
 STATIC UINT32 OsProcessInit(VOID)
 {
    UINT32 index;
    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);

-    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) {
        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_processRecycleList);
+    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);//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++) {
-        g_processCBArray[index].processID = index;
+    for (index = 0; index < g_processMaxNum; index++) {//进程池循环创建
+        g_processCBArray[index].processID = index;//进程ID[0-g_processMaxNum-1]赋值
        g_processCBArray[index].processStatus = OS_PROCESS_FLAG_UNUSED;
        LOS_ListTailInsert(&g_freeProcess, &g_processCBArray[index].pendList);
    }
@ -510,16 +516,16 @@ STATIC UINT32 OsProcessInit(VOID)

    return LOS_OK;
 }
-
+/*! 进程回收再利用过程*/
 LITE_OS_SEC_TEXT VOID OsProcessCBRecycleToFree(VOID)
 {
    UINT32 intSave;
    LosProcessCB *processCB = NULL;

    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));
-        if (!(processCB->processStatus & OS_PROCESS_FLAG_EXIT)) {
+        if (!(processCB->processStatus & OS_PROCESS_FLAG_EXIT)) {//进程没有退出标签
            break;
        }
        SCHEDULER_UNLOCK(intSave);
@ -530,32 +536,32 @@ LITE_OS_SEC_TEXT VOID OsProcessCBRecycleToFree(VOID)
        processCB->processStatus &= ~OS_PROCESS_FLAG_EXIT;
 #ifdef LOSCFG_KERNEL_VM
        LosVmSpace *space = NULL;
-        if (OsProcessIsUserMode(processCB)) {
-            space = processCB->vmSpace;
+        if (OsProcessIsUserMode(processCB)) {//进程是否是用户态进程
+            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;
 #endif
        /* 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.
         */
-        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) ||
            (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 {
            /* 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);
 #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
        SCHEDULER_LOCK(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)
 {
    UINT32 intSave;
@ -565,11 +571,11 @@ STATIC VOID OsDeInitPCB(LosProcessCB *processCB)
        return;
    }

-    OsProcessResourcesToFree(processCB);
+    OsProcessResourcesToFree(processCB);//释放进程所占用的资源

    SCHEDULER_LOCK(intSave);
    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;
    }

@ -577,8 +583,8 @@ STATIC VOID OsDeInitPCB(LosProcessCB *processCB)
        OsExitProcessGroup(processCB, &group);
    }

-    processCB->processStatus &= ~OS_PROCESS_STATUS_INIT;
-    processCB->processStatus |= OS_PROCESS_FLAG_EXIT;
+    processCB->processStatus &= ~OS_PROCESS_STATUS_INIT;//设置进程状态为非初始化
+    processCB->processStatus |= OS_PROCESS_FLAG_EXIT;//设置进程状态为退出
    LOS_ListHeadInsert(&g_processRecycleList, &processCB->pendList);
    SCHEDULER_UNLOCK(intSave);

@ -586,7 +592,7 @@ STATIC VOID OsDeInitPCB(LosProcessCB *processCB)
    OsWriteResourceEvent(OS_RESOURCE_EVENT_FREE);
    return;
 }
-
+/*! 设置进程的名字*/
 UINT32 OsSetProcessName(LosProcessCB *processCB, const CHAR *name)
 {
    errno_t errRet;
@ -618,29 +624,28 @@ UINT32 OsSetProcessName(LosProcessCB *processCB, const CHAR *name)
    }
    return LOS_OK;
 }
-
+/*! 初始化PCB(进程控制块)*/
 STATIC UINT32 OsInitPCB(LosProcessCB *processCB, UINT32 mode, UINT16 priority, const CHAR *name)
 {
-    processCB->processMode = mode;
-    processCB->processStatus = OS_PROCESS_STATUS_INIT;
-    processCB->parentProcessID = OS_INVALID_VALUE;
-    processCB->threadGroupID = OS_INVALID_VALUE;
-    processCB->priority = priority;
-    processCB->umask = OS_PROCESS_DEFAULT_UMASK;
+    processCB->processMode = mode;						//用户态进程还是内核态进程
+    processCB->processStatus = OS_PROCESS_STATUS_INIT;	//进程初始状态
+    processCB->parentProcess = NULL;
+    processCB->threadGroup = NULL;
+    processCB->umask = OS_PROCESS_DEFAULT_UMASK;		//掩码
    processCB->timerID = (timer_t)(UINTPTR)MAX_INVALID_TIMER_VID;

-    LOS_ListInit(&processCB->threadSiblingList);
-    LOS_ListInit(&processCB->childrenList);
-    LOS_ListInit(&processCB->exitChildList);
-    LOS_ListInit(&(processCB->waitList));
+    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);		//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);	//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));		//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
-    if (OsProcessIsUserMode(processCB)) {
-        processCB->vmSpace = OsCreateUserVmSpace();
+    if (OsProcessIsUserMode(processCB)) {//如果是用户态进程
+        processCB->vmSpace = OsCreateUserVmSpace();//创建用户空间
        if (processCB->vmSpace == NULL) {
            processCB->processStatus = OS_PROCESS_FLAG_UNUSED;
            return LOS_ENOMEM;
-        }
+        }//在鸿蒙内核态进程只有kprocess 和 kidle 两个 
    } else {
        processCB->vmSpace = LOS_GetKVmSpace();
    }
@ -653,7 +658,7 @@ STATIC UINT32 OsInitPCB(LosProcessCB *processCB, UINT32 mode, UINT16 priority, c
    }
 #endif
 #ifdef LOSCFG_SECURITY_CAPABILITY
-    OsInitCapability(processCB);
+    OsInitCapability(processCB);//初始化进程安全相关功能
 #endif

    if (OsSetProcessName(processCB, name) != LOS_OK) {
@ -662,10 +667,10 @@ STATIC UINT32 OsInitPCB(LosProcessCB *processCB, UINT32 mode, UINT16 priority, c

    return LOS_OK;
 }
-
+//创建用户
 #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));
    if (user == NULL) {
        return NULL;
@ -675,11 +680,11 @@ STATIC User *OsCreateUser(UINT32 userID, UINT32 gid, UINT32 size)
    user->effUserID = userID;
    user->gid = gid;
    user->effGid = gid;
-    user->groupNumber = size;
-    user->groups[0] = gid;
+    user->groupNumber = size;//用户组数量
+    user->groups[0] = gid;  //用户组列表,一个用户可以属于多个用户组
    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)
 {
    UINT32 intSave;
@ -687,8 +692,8 @@ LITE_OS_SEC_TEXT BOOL LOS_CheckInGroups(UINT32 gid)
    User *user = NULL;

    SCHEDULER_LOCK(intSave);
-    user = OsCurrUserGet();
-    for (count = 0; count < user->groupNumber; count++) {
+    user = OsCurrUserGet();//当前进程所属用户
+    for (count = 0; count < user->groupNumber; count++) {//循环对比
        if (user->groups[count] == gid) {
            SCHEDULER_UNLOCK(intSave);
            return TRUE;
@ -699,7 +704,7 @@ LITE_OS_SEC_TEXT BOOL LOS_CheckInGroups(UINT32 gid)
    return FALSE;
 }
 #endif
-
+/*! 获取当前进程的用户ID*/
 LITE_OS_SEC_TEXT INT32 LOS_GetUserID(VOID)
 {
 #ifdef LOSCFG_SECURITY_CAPABILITY
@ -714,7 +719,7 @@ LITE_OS_SEC_TEXT INT32 LOS_GetUserID(VOID)
    return 0;
 #endif
 }
-
+/*! 获取当前进程的用户组ID*/
 LITE_OS_SEC_TEXT INT32 LOS_GetGroupID(VOID)
 {
 #ifdef LOSCFG_SECURITY_CAPABILITY
@ -730,7 +735,7 @@ LITE_OS_SEC_TEXT INT32 LOS_GetGroupID(VOID)
    return 0;
 #endif
 }
-
+/*! 进程创建初始化*/
 STATIC UINT32 OsProcessCreateInit(LosProcessCB *processCB, UINT32 flags, const CHAR *name, UINT16 priority)
 {
    ProcessGroup *group = NULL;
@ -777,7 +782,7 @@ EXIT:
    OsDeInitPCB(processCB);
    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)
 {
    UINT32 ret = OsProcessInit();
@ -791,13 +796,13 @@ LITE_OS_SEC_TEXT_INIT UINT32 OsSystemProcessCreate(VOID)
        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;
    LOS_ListInit(&g_processGroup->groupList);
    OsCurrProcessSet(kerInitProcess);

    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) {
        return ret;
    }
@ -820,7 +825,7 @@ LITE_OS_SEC_TEXT_INIT UINT32 OsSystemProcessCreate(VOID)

    return LOS_OK;
 }
-
+/// 进程调度参数检查
 STATIC INLINE INT32 OsProcessSchedlerParamCheck(INT32 which, INT32 pid, UINT16 prio, UINT16 policy)
 {
    if (OS_PID_CHECK_INVALID(pid)) {