taskSpawn 函数的使用问题

[billy123456]

int taskSpawn
(
char *name, /*你要创建的任务名：比如说task1，在Shell下可以用命令：i 来查看当前系统中所有的任务*/
int priority, /*任务优先级，*/
int options, /*一般为0*/
int stackSize, /* 需要申请堆栈的大小*/
FUNCPTR entryPt, /*回调函数，*/
int arg1, /*传递给处理任务回调函数所需要的参数*/
int arg2,
int arg3,
int arg4,
int arg5,
int arg6,
int arg7,
int arg8,
int arg9,
int arg10
)

typedef struct
{
}Stype;
typedef Stype *pStype;
如果发起一个任务
void function(pStype Sty)
{
}
那么taskSpawn 中的参数 arg1 应怎么样写啊？一个结构体指针吗？

[loopback_2012]

有啥参数就填什么，没有就不填，找个例子看下你就明白了

[能写程序-会种庄稼]

理解成entryPt的参数就对了。如果entryPt不需要参数，那写0就好了。

[能写程序-会种庄稼]

引用 vxworks6.8文档 的回复:

The arguments to taskSpawn( ) are the new task’s name (an ASCII string), the task’s priority, an options word, the stack size, the main routine address, and 10 arguments to be passed to the main routine as startup parameters: id = taskSpawn ( name, priority, options, stacksize, main, arg1, …arg10 );

/*Example 7-6 POSIX Unnamed Semaphores*/
/*
* This example uses unnamed semaphores to synchronize an action between the
* calling task and a task that it spawns (tSyncTask). To run from the shell,
* spawn as a task:
*
* -> sp unnameSem
*/
/* includes */
#include <vxWorks.h>
#include <semaphore.h>
/* forward declarations */
void syncTask (sem_t * pSem);
/************************************************************************
* unnameSem - test case for unamed semaphores
*
* This routine tests unamed semaphores.
*
* RETURNS: N/A
*
* ERRNOS: N/A
*/
void unnameSem (void)
{
sem_t * pSem;
/* reserve memory for semaphore */
pSem = (sem_t *) malloc (sizeof (sem_t));
if (pSem == NULL)
{
printf ("pSem allocation failed\n");
return;
}
/* initialize semaphore to unavailable */
if (sem_init (pSem, 0, 0) == -1)
{
printf ("unnameSem: sem_init failed\n");
free ((char *) pSem);
return;
}
/* create sync task */
printf ("unnameSem: spawning task...\n");
if (taskSpawn ("tSyncTask", 90, 0, 2000, syncTask, pSem) == ERROR)
{
printf ("Failed to spawn tSyncTask\n");
sem_destroy (pSem);
free ((char *) pSem);
return;
}
/* do something useful to synchronize with syncTask */
/* unlock sem */
printf ("unnameSem: posting semaphore - synchronizing action\n");
if (sem_post (pSem) == -1)
{
printf ("unnameSem: posting semaphore failed\n");
sem_destroy (pSem);
free ((char *) pSem);
return;
}
/* all done - destroy semaphore */
if (sem_destroy (pSem) == -1)
{
printf ("unnameSem: sem_destroy failed\n");
return;
}
free ((char *) pSem);
}
void syncTask
(
sem_t * pSem
)
{
/* wait for synchronization from unnameSem */
if (sem_wait (pSem) == -1)
{
printf ("syncTask: sem_wait failed \n");
return;
}
else
printf ("syncTask: sem locked; doing sync’ed action...\n");
/* do something useful here */
}

以上是文档中的例子

[「已注销」]

一般情况下，填0就可以了。

[woquNOKIA]

不用的就用0

[i80428048]

/*****************/
typedef  struct
{
}Stype;
typedef  Stype  *pStype;

void function(pStype   Sty)
{
}
pStype arg;

taskSpawn ("tTest", 101, 0, 10000, function, arg,0,0,0,0,0,0,0,0,0)/*其余填零*/

[紫神]

转化为int类型再传，传入后转回来， int指针也是4字节。。。。