diff options
Diffstat (limited to 'nuttx/arch/avr/src/avr32/up_unblocktask.c')
| -rw-r--r-- | nuttx/arch/avr/src/avr32/up_unblocktask.c | 95 |
1 files changed, 45 insertions, 50 deletions
diff --git a/nuttx/arch/avr/src/avr32/up_unblocktask.c b/nuttx/arch/avr/src/avr32/up_unblocktask.c index 5ce48e366..1fcfa1dd7 100644 --- a/nuttx/arch/avr/src/avr32/up_unblocktask.c +++ b/nuttx/arch/avr/src/avr32/up_unblocktask.c @@ -1,7 +1,7 @@ /**************************************************************************** * arch/avr/src/avr32/up_unblocktask.c * - * Copyright (C) 2010 Gregory Nutt. All rights reserved. + * Copyright (C) 2010, 2013 Gregory Nutt. All rights reserved. * Author: Gregory Nutt <gnutt@nuttx.org> * * Redistribution and use in source and binary forms, with or without @@ -81,77 +81,72 @@ void up_unblock_task(struct tcb_s *tcb) { + struct tcb_s *rtcb = (struct tcb_s*)g_readytorun.head; + /* Verify that the context switch can be performed */ - if ((tcb->task_state < FIRST_BLOCKED_STATE) || - (tcb->task_state > LAST_BLOCKED_STATE)) - { - PANIC(OSERR_BADUNBLOCKSTATE); - } - else - { - struct tcb_s *rtcb = (struct tcb_s*)g_readytorun.head; + ASSERT((tcb->task_state >= FIRST_BLOCKED_STATE) && + (tcb->task_state <= LAST_BLOCKED_STATE)); - /* Remove the task from the blocked task list */ + /* Remove the task from the blocked task list */ - sched_removeblocked(tcb); + sched_removeblocked(tcb); - /* Reset its timeslice. This is only meaningful for round - * robin tasks but it doesn't here to do it for everything - */ + /* Reset its timeslice. This is only meaningful for round + * robin tasks but it doesn't here to do it for everything + */ #if CONFIG_RR_INTERVAL > 0 - tcb->timeslice = CONFIG_RR_INTERVAL / MSEC_PER_TICK; + tcb->timeslice = CONFIG_RR_INTERVAL / MSEC_PER_TICK; #endif - /* Add the task in the correct location in the prioritized - * g_readytorun task list + /* Add the task in the correct location in the prioritized + * g_readytorun task list + */ + + if (sched_addreadytorun(tcb)) + { + /* The currently active task has changed! We need to do + * a context switch to the new task. + * + * Are we in an interrupt handler? */ - if (sched_addreadytorun(tcb)) + if (current_regs) { - /* The currently active task has changed! We need to do - * a context switch to the new task. - * - * Are we in an interrupt handler? + /* Yes, then we have to do things differently. + * Just copy the current_regs into the OLD rtcb. */ - if (current_regs) - { - /* Yes, then we have to do things differently. - * Just copy the current_regs into the OLD rtcb. - */ + up_savestate(rtcb->xcp.regs); - up_savestate(rtcb->xcp.regs); - - /* Restore the exception context of the rtcb at the (new) head - * of the g_readytorun task list. - */ + /* Restore the exception context of the rtcb at the (new) head + * of the g_readytorun task list. + */ - rtcb = (struct tcb_s*)g_readytorun.head; + rtcb = (struct tcb_s*)g_readytorun.head; - /* Then switch contexts */ + /* Then switch contexts */ - up_restorestate(rtcb->xcp.regs); - } + up_restorestate(rtcb->xcp.regs); + } - /* No, then we will need to perform the user context switch */ + /* No, then we will need to perform the user context switch */ - else - { - /* Switch context to the context of the task at the head of the - * ready to run list. - */ + else + { + /* Switch context to the context of the task at the head of the + * ready to run list. + */ - struct tcb_s *nexttcb = (struct tcb_s*)g_readytorun.head; - up_switchcontext(rtcb->xcp.regs, nexttcb->xcp.regs); + struct tcb_s *nexttcb = (struct tcb_s*)g_readytorun.head; + up_switchcontext(rtcb->xcp.regs, nexttcb->xcp.regs); - /* up_switchcontext forces a context switch to the task at the - * head of the ready-to-run list. It does not 'return' in the - * normal sense. When it does return, it is because the blocked - * task is again ready to run and has execution priority. - */ - } + /* up_switchcontext forces a context switch to the task at the + * head of the ready-to-run list. It does not 'return' in the + * normal sense. When it does return, it is because the blocked + * task is again ready to run and has execution priority. + */ } } } |