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fix scheduler bug in simulator.

This commit is contained in:
unknown 2020-12-23 10:35:26 +08:00
parent c924330469
commit 76b6d7f90d
2 changed files with 24 additions and 2 deletions
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22
libcpu/sim/win32/cpu_port.c
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@ -27,6 +27,8 @@
* The context switch is managed by the threads.So the task stack does not have to be managed directly,
* although the stack stack is still used to hold an WinThreadState structure this is the only thing it
* will be ever hold.
* YieldEvent used to make sure the thread does not execute before asynchronous SuspendThread() operation
* actually being performed.
* the structure indirectly maps the task handle to a thread handle
*********************************************************************************************************
*/
@ -35,6 +37,7 @@ typedef struct
void *Param; //Thread param
void (*Entry)(void *); //Thread entry
void (*Exit)(void); //Thread exit
HANDLE YieldEvent;
HANDLE ThreadHandle;
DWORD ThreadID;
}win_thread_t;
@ -171,6 +174,11 @@ rt_uint8_t* rt_hw_stack_init(void *pEntry,void *pParam,rt_uint8_t *pStackAddr,vo
pWinThread->ThreadHandle = NULL;
pWinThread->ThreadID = 0;
pWinThread->YieldEvent = CreateEvent(NULL,
FALSE,
FALSE,
NULL);
/* Create the winthread */
pWinThread->ThreadHandle = CreateThread(NULL,
0,
@ -277,6 +285,19 @@ void rt_hw_context_switch(rt_uint32_t from,
//trigger YIELD exception(cause contex switch)
TriggerSimulateInterrupt(CPU_INTERRUPT_YIELD);
// make sure the event is not already signaled
WinThread = (win_thread_t *)rt_interrupt_from_thread;
ResetEvent(WinThread->YieldEvent);
/*
* enable interrupt in advance so that scheduler can be executed.please note that interrupt
* maybe disable twice before.
*/
rt_hw_interrupt_enable(0);
rt_hw_interrupt_enable(0);
// wait to suspend.
WaitForSingleObject(WinThread->YieldEvent, INFINITE);
} /*** rt_hw_context_switch ***/
/*
@ -578,6 +599,7 @@ void RegisterSimulateInterrupt(rt_uint32_t IntIndex,rt_uint32_t (*IntHandler)(vo
if ((WinThreadFrom != NULL) && (WinThreadFrom->ThreadHandle != NULL))
{
SuspendThread(WinThreadFrom->ThreadHandle);
SetEvent(WinThreadFrom->YieldEvent);
}
ResumeThread(WinThreadTo->ThreadHandle);

4
libcpu/sim/win32/cpu_port.h
View File

@ -17,8 +17,8 @@
* CPU INTERRUPT PRIORITY
*********************************************************************************************************
*/
#define CPU_INTERRUPT_YIELD 0x00
#define CPU_INTERRUPT_TICK 0x01
#define CPU_INTERRUPT_YIELD 0x01 // should be set to the lowest priority.
#define CPU_INTERRUPT_TICK 0x00