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New callback module
git-svn-id: svn://svn.cc65.org/cc65/trunk@2140 b7a2c559-68d2-44c3-8de9-860c34a00d81
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src/sim65/callback.c
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191
src/sim65/callback.c
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/*****************************************************************************/
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/* */
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/* callback.c */
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/* */
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/* Chip callbacks */
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/* */
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/* */
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/* */
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/* (C) 2003 Ullrich von Bassewitz */
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/* Römerstrasse 52 */
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/* D-70794 Filderstadt */
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/* EMail: uz@cc65.org */
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/* */
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/* */
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/* This software is provided 'as-is', without any expressed or implied */
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/* warranty. In no event will the authors be held liable for any damages */
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/* arising from the use of this software. */
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/* */
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/* Permission is granted to anyone to use this software for any purpose, */
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/* including commercial applications, and to alter it and redistribute it */
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/* freely, subject to the following restrictions: */
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/* */
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/* 1. The origin of this software must not be misrepresented; you must not */
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/* claim that you wrote the original software. If you use this software */
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/* in a product, an acknowledgment in the product documentation would be */
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/* appreciated but is not required. */
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/* 2. Altered source versions must be plainly marked as such, and must not */
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/* be misrepresented as being the original software. */
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/* 3. This notice may not be removed or altered from any source */
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/* distribution. */
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/* */
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/*****************************************************************************/
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/* common */
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#include "xmalloc.h"
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/* sim65 */
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#include "error.h"
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#include "callback.h"
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/*****************************************************************************/
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/* Data */
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/*****************************************************************************/
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struct Callback {
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Callback* Next; /* Next entry in list */
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unsigned Ticks; /* Remaining ticks */
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CallbackFunc UserFunc; /* User function */
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void* UserData; /* User data */
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};
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/* Delta list that keeps existing callbacks */
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static Callback* List = 0;
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/*****************************************************************************/
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/* Routines that handle the delta list */
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/*****************************************************************************/
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static void InsertCallback (Callback* C, unsigned Ticks)
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/* Insert the callback C into the delta list */
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{
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/* Search for the insertion point */
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Callback* N;
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Callback** L = &List;
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while ((N = *L) != 0) {
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/* Check if the next callback in the list has a higher wait time */
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if (N->Ticks > Ticks) {
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/* Insert before this callback */
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N->Ticks -= Ticks;
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break;
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} else {
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/* Insert behind this callback */
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Ticks -= N->Ticks;
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L = &N->Next;
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}
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}
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/* Insert the new task */
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C->Ticks = Ticks;
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C->Next = N;
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*L = C;
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}
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static void RemoveCallback (Callback* C)
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/* Remove a callback from the list. If the callback is not in the list, this
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* is a fatal error.
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*/
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{
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Callback* N;
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Callback** L = &List;
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while ((N = *L) != 0) {
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if (N == C) {
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/* Found, remove it */
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if (C->Next) {
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/* Adjust the counter of the following callback */
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C->Next->Ticks += C->Ticks;
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}
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*L = C->Next;
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return;
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} else {
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L = &N->Next;
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}
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}
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/* Callback was not found */
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Internal ("RemoveCallback: Callback not found in list!");
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}
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/*****************************************************************************/
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/* Code */
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/*****************************************************************************/
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Callback* NewCallback (unsigned Ticks, CallbackFunc Func, void* Data)
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/* Create a callback for function F to be called in Ticks ticks. */
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{
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/* Allocate memory */
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Callback* C = xmalloc (sizeof (Callback));
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/* Initialize the fields */
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C->UserFunc = Func;
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C->UserData = Data;
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/* Insert the callback into the delta list */
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InsertCallback (C, Ticks);
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/* Return the new callback */
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return C;
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}
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void FreeCallback (Callback* C)
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/* Delete a callback (remove from the queue) */
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{
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/* Remove the callback from the list */
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RemoveCallback (C);
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/* Delete it */
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xfree (C);
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}
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void HandleCallbacks (unsigned TicksSinceLastCall)
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/* Handle the callback queue */
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{
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while (List) {
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/* Check if this one is due */
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if (List->Ticks <= TicksSinceLastCall) {
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/* Calclulate the tick offset */
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int TickOffs = ((int) List->Ticks) - ((int) TicksSinceLastCall);
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/* Retrieve the first callback from the list */
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Callback* C = List;
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List = C->Next;
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/* Call the user function */
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C->UserFunc (TickOffs, C->UserData);
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/* Delete the callback */
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xfree (C);
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} else {
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List->Ticks -= TicksSinceLastCall;
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break;
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}
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}
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}
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77
src/sim65/callback.h
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77
src/sim65/callback.h
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@ -0,0 +1,77 @@
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/*****************************************************************************/
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/* */
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/* callback.h */
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/* */
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/* Chip callbacks */
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/* */
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/* */
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/* */
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/* (C) 2003 Ullrich von Bassewitz */
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/* Römerstrasse 52 */
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/* D-70794 Filderstadt */
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/* EMail: uz@cc65.org */
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/* */
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/* */
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/* This software is provided 'as-is', without any expressed or implied */
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/* warranty. In no event will the authors be held liable for any damages */
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/* arising from the use of this software. */
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/* */
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/* Permission is granted to anyone to use this software for any purpose, */
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/* including commercial applications, and to alter it and redistribute it */
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/* freely, subject to the following restrictions: */
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/* */
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/* 1. The origin of this software must not be misrepresented; you must not */
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/* claim that you wrote the original software. If you use this software */
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/* in a product, an acknowledgment in the product documentation would be */
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/* appreciated but is not required. */
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/* 2. Altered source versions must be plainly marked as such, and must not */
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/* be misrepresented as being the original software. */
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/* 3. This notice may not be removed or altered from any source */
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/* distribution. */
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/* */
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/*****************************************************************************/
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#ifndef CALLBACK_H
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#define CALLBACK_H
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/*****************************************************************************/
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/* Data */
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/*****************************************************************************/
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/* Type of a callback function */
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typedef void (*CallbackFunc) (int TickOffs, void* UserData);
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/* Forward */
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typedef struct Callback Callback;
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/*****************************************************************************/
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/* Code */
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/*****************************************************************************/
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Callback* NewCallback (unsigned Ticks, CallbackFunc Func, void* Data);
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/* Create a callback for function F to be called in Ticks ticks. */
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void FreeCallback (Callback* C);
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/* Delete a callback (remove from the queue) */
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void HandleCallbacks (unsigned TicksSinceLastCall);
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/* Handle the callback queue */
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/* End of callback.h */
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#endif
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@ -11,6 +11,7 @@ EBIND = emxbind
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LDFLAGS =
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OBJS = addrspace.o \
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callback.o \
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cfgdata.o \
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chip.o \
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chippath.o \
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