feature: Support kernel signal and POSIX API.

内核支持信号功能，支持注册、屏蔽、等待及触发等操作。

close #I4R72Q

Signed-off-by: JerryH <huangjieliang@huawei.com>
Change-Id: I26fb11a03d1899c6f7e665f0798824c578d592a6

kernel/include/los_config.h

@@ -651,12 +651,10 @@ extern UINT8 *m_aucSysMem0;
 
 /**
  * @ingroup los_config
- * Configuration item to enable pipe device.
+ * Configuration item to enable kernel signal.
  */
-#ifndef LOSCFG_POSIX_PIPE_API
-#ifndef LOSCFG_PIPE_DEV
-#define LOSCFG_POSIX_PIPE_API                         0
-#endif
+#ifndef LOSCFG_KERNEL_SIGNAL
+#define LOSCFG_KERNEL_SIGNAL                          0
 #endif
 
 #ifdef __cplusplus

kernel/include/los_task.h

@@ -430,6 +430,16 @@ extern "C" {
  */
 #define LOS_ERRNO_TSK_SCHED_LOCKED                  LOS_ERRNO_OS_ERROR(LOS_MOD_TSK, 0x28)
 
+/**
+ * @ingroup los_task
+ * Task error code: The task is processing signals.
+ *
+ * Value: 0x02000229
+ *
+ * Solution: Check and Stop the trigger signal so that the task is not processing the signal.
+ */
+#define LOS_ERRNO_TSK_PROCESS_SIGNAL                LOS_ERRNO_OS_ERROR(LOS_MOD_TSK, 0x29)
+
 /**
  * @ingroup los_task
  * Define the type of the task entry function.
@@ -1293,6 +1303,13 @@ extern UINT32 LOS_TaskDetach(UINT32 taskID);
  */
 #define OS_TASK_FLAG_SYSTEM_TASK                    0x1000U
 
+/**
+ * @ingroup los_task
+ * Flag that indicates the task is processing signal.
+ *
+ */
+#define OS_TASK_FLAG_SIGNAL                         0x2000
+
 /**
  * @ingroup los_task
  * Flag that indicates the task or task control block status.
@@ -1480,6 +1497,9 @@ typedef struct {
     UINT32                      eventMode;                /**< Event mode */
     VOID                        *msg;                     /**< Memory allocated to queues */
     INT32                       errorNo;
+#if (LOSCFG_KERNEL_SIGNAL == 1)
+    VOID                        *sig;                     /**< Task signal */
+#endif
     LOSCFG_TASK_STRUCT_EXTENSION                          /**< Task extension field */
 } LosTaskCB;
 
@@ -1754,6 +1774,11 @@ extern VOID *OsTskUserStackInit(VOID* stackPtr, VOID* userSP, UINT32 userStackSi
 
 extern UINT32 OsPmEnterHandlerSet(VOID (*func)(VOID));
 
+STATIC INLINE LosTaskCB *OsCurrTaskGet(VOID)
+{
+    return g_losTask.runTask;
+}
+
 #ifdef __cplusplus
 #if __cplusplus
 }

kernel/src/los_init.c

@@ -78,6 +78,10 @@
 #include "pipe_impl.h"
 #endif
 
+#if (LOSCFG_KERNEL_SIGNAL == 1)
+#include "los_signal.h"
+#endif
+
 /*****************************************************************************
  Function    : LOS_Reboot
  Description : system exception, die in here, wait for watchdog.
@@ -250,6 +254,14 @@ LITE_OS_SEC_TEXT_INIT UINT32 LOS_KernelInit(VOID)
     }
 #endif
 
+#if (LOSCFG_KERNEL_SIGNAL == 1)
+    ret = OsSignalInit();
+    if (ret != LOS_OK) {
+        PRINT_ERR("Signal init failed!\n");
+        return ret;
+    }
+#endif
+
     return LOS_OK;
 }
 

kernel/src/los_task.c

@@ -683,7 +683,10 @@ LITE_OS_SEC_TEXT_INIT UINT32 OsNewTaskInit(LosTaskCB *taskCB, TSK_INIT_PARAM_S *
     taskCB->eventMask       = 0;
     taskCB->taskName        = taskInitParam->pcName;
     taskCB->msg             = NULL;
-    taskCB->stackPointer    = ArchTskStackInit(taskCB->taskID, taskInitParam->uwStackSize, topOfStack);
+#if (LOSCFG_KERNEL_SIGNAL == 1)
+    taskCB->sig             = NULL;
+#endif
+
     SET_SORTLIST_VALUE(&taskCB->sortList, OS_SORT_LINK_INVALID_TIME);
     LOS_EventInit(&(taskCB->event));
 
@@ -691,6 +694,10 @@ LITE_OS_SEC_TEXT_INIT UINT32 OsNewTaskInit(LosTaskCB *taskCB, TSK_INIT_PARAM_S *
         taskCB->taskStatus |= OS_TASK_FLAG_JOINABLE;
         LOS_ListInit(&taskCB->joinList);
     }
+
+    *((UINT32 *)taskCB->topOfStack) = OS_TASK_MAGIC_WORD;
+    taskCB->stackPointer = ArchTskStackInit(taskCB->taskID, taskCB->stackSize, (VOID *)taskCB->topOfStack);
+
     return LOS_OK;
 }
 
@@ -744,6 +751,9 @@ LITE_OS_SEC_TEXT_INIT UINT32 LOS_TaskCreateOnly(UINT32 *taskID, TSK_INIT_PARAM_S
         LOS_IntRestore(intSave);
         return LOS_ERRNO_TSK_NO_MEMORY;
     }
+    /* initialize the task stack, write magic num to stack top */
+    (VOID)memset_s(topOfStack, taskInitParam->uwStackSize,
+                   (INT32)(OS_TASK_STACK_INIT & 0xFF), taskInitParam->uwStackSize);
 
     retVal = OsNewTaskInit(taskCB, taskInitParam, topOfStack);
     if (retVal != LOS_OK) {
@@ -1066,6 +1076,11 @@ LITE_OS_SEC_TEXT_INIT UINT32 LOS_TaskDelete(UINT32 taskID)
         return LOS_ERRNO_TSK_ALREADY_EXIT;
     }
 
+    if (taskCB->taskStatus & OS_TASK_FLAG_SIGNAL) {
+        LOS_IntRestore(intSave);
+        return LOS_ERRNO_TSK_PROCESS_SIGNAL;
+    }
+
     /* If the task is running and scheduler is locked then you can not delete it */
     if (((taskCB->taskStatus) & OS_TASK_STATUS_RUNNING) && (g_losTaskLock != 0)) {
         PRINT_INFO("In case of task lock, task deletion is not recommended\n");
@@ -1084,6 +1099,13 @@ LITE_OS_SEC_TEXT_INIT UINT32 LOS_TaskDelete(UINT32 taskID)
     (VOID)memset_s((VOID *)&g_cpup[taskCB->taskID], sizeof(OsCpupCB), 0, sizeof(OsCpupCB));
 #endif
 
+#if (LOSCFG_KERNEL_SIGNAL == 1)
+    if (taskCB->sig != NULL) {
+        LOS_MemFree(OS_SYS_MEM_ADDR, taskCB->sig);
+        taskCB->sig = NULL;
+    }
+#endif
+
     LOSCFG_TASK_DELETE_EXTENSION_HOOK(taskCB);
 
     if (taskCB->taskStatus & OS_TASK_STATUS_RUNNING) {