?? ioc.c
字號(hào):
/* 03-01-1994 Changed function interfaces to */
/* match prototype, changed */
/* protection logic, resulting in */
/* version 1.1 */
/* */
/* 03-18-1994 Verified version 1.1 */
/* 04-23-1996 Corrected SPR121 */
/* */
/*************************************************************************/
STATUS IOC_Resume_Driver(NU_TASK *task)
{
TC_PROTECT *save_protect; /* Saved protect pointer */
NU_SUPERV_USER_VARIABLES
/* Switch to supervisor mode */
NU_SUPERVISOR_MODE();
#ifdef NU_ENABLE_STACK_CHECK
/* Call stack checking function to check for an overflow condition. */
TCT_Check_Stack();
#endif
#ifdef NU_ENABLE_HISTORY
/* Make an entry that corresponds to this function in the system history
log. */
HIC_Make_History_Entry(NU_RESUME_DRIVER_ID, (UNSIGNED) task,
(UNSIGNED) 0, (UNSIGNED) 0);
#endif
/* Pickup current protection. */
save_protect = TCT_Get_Current_Protect();
/* Protect against system access. */
TCT_System_Protect();
#ifdef INCLUDE_PROVIEW
_RTProf_DumpDriver(RT_PROF_RESUME_DRIVER, 0 , RT_PROF_OK);
#endif /*INCLUDE_PROVIEW*/
/* Resume the specified task. */
if (TCC_Resume_Task(task, NU_DRIVER_SUSPEND))
{
/* Only unprotect if there is protection in place. */
if (save_protect)
{
/* Release protection caller had. */
TCT_Unprotect_Specific(save_protect);
}
/* Transfer control to the system if the resumed task function
detects a preemption condition. */
TCT_Control_To_System();
}
else
{
/* Determine if there was protection previously in force. */
if (save_protect)
{
/* Switch to original protection. */
TCT_Set_Current_Protect(save_protect);
/* Release system protection. */
TCT_System_Unprotect();
}
else
/* Release system protection. */
TCT_Unprotect();
}
/* Return to user mode */
NU_USER_MODE();
/* Return the completion status. */
return(NU_SUCCESS);
}
/*************************************************************************/
/* */
/* FUNCTION */
/* */
/* IOC_Suspend_Driver */
/* */
/* DESCRIPTION */
/* */
/* This function suspends a task inside of an I/O driver. It is */
/* the responsibility of the I/O driver to keep track of tasks */
/* waiting inside of an I/O driver. */
/* */
/* CALLED BY */
/* */
/* Application */
/* IOCE_Suspend_Driver Error checking shell */
/* */
/* CALLS */
/* */
/* [HIC_Make_History_Entry] Make entry in history log */
/* TCC_Suspend_Task Suspend calling task */
/* TCT_Current_Thread Current task thread */
/* [TCT_Check_Stack] Stack checking function */
/* TCT_Get_Current_Protect Pickup current protect ptr */
/* TCT_Set_Suspend_Protect Setup suspend protect field */
/* TCT_System_Protect Protect against system access*/
/* TCT_Unprotect_Specific Release user protection */
/* */
/* INPUTS */
/* */
/* terminate_routine Termination/Timeout cleanup */
/* routine */
/* information Information pointer of the */
/* cleanup routine */
/* timeout Suspension timeout request */
/* */
/* OUTPUTS */
/* */
/* NU_SUCCESS If service is successful */
/* */
/* HISTORY */
/* */
/* DATE REMARKS */
/* */
/* 03-01-1993 Created initial version 1.0 */
/* 04-19-1993 Verified version 1.0 */
/* 03-01-1994 Changed protection logic, */
/* resulting in version 1.1 */
/* */
/* 03-18-1994 Verified version 1.1 */
/* 04-23-1996 Corrected SPR121. */
/* */
/*************************************************************************/
STATUS IOC_Suspend_Driver(VOID (*terminate_routine)(VOID *),
VOID *information, UNSIGNED timeout)
{
TC_PROTECT *suspend_protect; /* Current protection */
NU_SUPERV_USER_VARIABLES
/* Switch to supervisor mode */
NU_SUPERVISOR_MODE();
#ifdef NU_ENABLE_STACK_CHECK
/* Call stack checking function to check for an overflow condition. */
TCT_Check_Stack();
#endif
#ifdef NU_ENABLE_HISTORY
/* Make an entry that corresponds to this function in the system history
log. */
HIC_Make_History_Entry(NU_SUSPEND_DRIVER_ID, (UNSIGNED) terminate_routine,
(UNSIGNED) information, (UNSIGNED) timeout);
#endif
/* Pickup current protect. */
suspend_protect = TCT_Get_Current_Protect();
/* Setup system protection. */
TCT_System_Protect();
#ifdef INCLUDE_PROVIEW
_RTProf_DumpDriver(RT_PROF_SUSPEND_DRIVER, 0 , RT_PROF_OK);
#endif /*INCLUDE_PROVIEW*/
/* If no protection exists, don't unprotect. */
if (suspend_protect)
{
/* Release initial protection. */
TCT_Unprotect_Specific(suspend_protect);
/* Save suspend protect for timeout and terminate. */
TCT_Set_Suspend_Protect(suspend_protect);
}
/* Suspend the calling task. */
TCC_Suspend_Task((NU_TASK *) TCT_Current_Thread(), NU_DRIVER_SUSPEND,
terminate_routine, information, timeout);
/* Return to user mode */
NU_USER_MODE();
/* Return the completion status. */
return(NU_SUCCESS);
}
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