Mercurial > cgi-bin > hgwebdir.cgi > VMS > VMS_Implementations > VMS_impls > VMS__MC_shared_impl
view VMS.c @ 14:65c8fb2821ee
Forgot to commit after had working test -- changed stack & frame ptrs in thd params
to be instead in virt procr struc -- stopped working! Saving now, then going back to
way had it..
| author | Me |
|---|---|
| date | Tue, 22 Jun 2010 11:52:41 -0700 |
| parents | d801fe740275 |
| children | 734c665500e4 |
line source
1 /*
2 * Copyright 2010 OpenSourceCodeStewardshipFoundation
3 *
4 * Licensed under BSD
5 */
7 #include <stdio.h>
8 #include <stdlib.h>
9 #include <malloc.h>
11 #include "VMS.h"
12 #include "Queue_impl/BlockingQueue.h"
15 /*Setup has two phases:
16 * 1) Semantic layer first calls init_VMS, which creates masterEnv, and puts
17 * the master virt procr into the work-queue, ready for first "call"
18 * 2) Semantic layer then does its own init, which creates the seed virt
19 * procr inside the semantic layer, ready to schedule it when
20 * asked by the first run of the masterLoop.
21 *
22 *This part is bit weird because VMS really wants to be "always there", and
23 * have applications attach and detach.. for now, this VMS is part of
24 * the app, so the VMS system starts up as part of running the app.
25 *
26 *The semantic layer is isolated from the VMS internals by making the
27 * semantic layer do setup to a state that it's ready with its
28 * initial virt procrs, ready to schedule them to slots when the masterLoop
29 * asks. Without this pattern, the semantic layer's setup would
30 * have to modify slots directly to assign the initial virt-procrs, and put
31 * them into the workQ itself, breaking the isolation completely.
32 *
33 *
34 *The semantic layer creates the initial virt procr(s), and adds its
35 * own environment to masterEnv, and fills in the pointers to
36 * the requestHandler and slaveScheduler plug-in functions
37 */
39 void
40 create_sched_slots( MasterEnv *masterEnv );
43 /*This allocates VMS data structures, populates the master VMSProc,
44 * and master environment, and returns the master environment to the semantic
45 * layer.
46 */
47 void
48 VMS__init()
49 { MasterEnv *masterEnv;
50 CASQueueStruc *workQ;
52 //Make the central work-queue
53 _VMSWorkQ = makeCASQ();
54 workQ = _VMSWorkQ;
56 _VMSMasterEnv = malloc( sizeof(MasterEnv) );
57 masterEnv = _VMSMasterEnv;
59 //create the master virtual processor
60 masterEnv->masterVirtPr = VMS__create_procr( &masterLoop, masterEnv );
62 create_sched_slots( masterEnv );
64 //Set slot 0 to be the master virt procr & set flags just in case
65 masterEnv->schedSlots[0]->needsProcrAssigned = FALSE; //says don't touch
66 masterEnv->schedSlots[0]->workIsDone = FALSE; //says don't touch
67 masterEnv->schedSlots[0]->procrAssignedToSlot = masterEnv->masterVirtPr;
69 //First core loop to start up gets this, which will schedule seed Pr
70 //TODO: debug: check address of masterVirtPr
71 //TODO: commented out for debugging -- put it back in!!
72 // writeCASQ( masterEnv->masterVirtPr, workQ );
74 numProcrsCreated = 1;
75 }
78 void
79 create_sched_slots( MasterEnv *masterEnv )
80 { SchedSlot **schedSlots, **filledSlots;
81 int i;
83 schedSlots = malloc( NUM_SCHED_SLOTS * sizeof(SchedSlot *) );
84 filledSlots = malloc( NUM_SCHED_SLOTS * sizeof(SchedSlot *) );
85 masterEnv->schedSlots = schedSlots;
86 masterEnv->filledSlots = filledSlots;
88 for( i = 0; i < NUM_SCHED_SLOTS; i++ )
89 {
90 schedSlots[i] = malloc( sizeof(SchedSlot) );
92 //Set state to mean "handling requests done, slot needs filling"
93 schedSlots[i]->workIsDone = FALSE;
94 schedSlots[i]->needsProcrAssigned = TRUE;
95 }
96 }
99 /*Semantic layer calls this when it want the system to start running..
100 *
101 *This creates the core loops, pins them to physical cores, gives them the
102 * pointer to the workQ, and starts them running.
103 */
104 void
105 VMS__start()
106 { int coreIdx;
108 //TODO: Save "orig" stack pointer and frame ptr -- restore in VMS__end()
109 //Create the win threads that animate the core loops
110 for( coreIdx=0; coreIdx < NUM_CORES; coreIdx++ )
111 {
112 coreLoopThdParams[coreIdx] = (ThdParams *)malloc( sizeof(ThdParams) );
113 coreLoopThdParams[coreIdx]->coreNum = coreIdx;
115 coreLoopThdHandles[coreIdx] =
116 CreateThread ( NULL, // Security attributes
117 0, // Stack size
118 coreLoop,
119 coreLoopThdParams[coreIdx],
120 CREATE_SUSPENDED,
121 &(coreLoopThdIds[coreIdx])
122 );
123 ResumeThread( coreLoopThdHandles[coreIdx] ); //starts thread
124 }
125 }
129 /*Create stack, then create __cdecl structure on it and put initialData and
130 * pointer to the new structure instance into the parameter positions on
131 * the stack
132 *Then put function pointer into nextInstrPt -- the stack is setup in std
133 * call structure, so jumping to function ptr is same as a GCC generated
134 * function call
135 *No need to save registers on old stack frame, because there's no old
136 * animator state to return to --
137 *
138 */
139 VirtProcr *
140 VMS__create_procr( VirtProcrFnPtr fnPtr, void *initialData )
141 { VirtProcr *newPr;
142 char *stackLocs, *stackPtr;
144 newPr = malloc( sizeof(VirtProcr) );
145 newPr->procrID = numProcrsCreated++;
146 newPr->nextInstrPt = fnPtr;
147 newPr->initialData = initialData;
149 //fnPtr takes two params -- void *initData & void *animProcr
150 //alloc stack locations, make stackPtr be the highest addr minus room
151 // for 2 params + return addr. Return addr (NULL) is in loc pointed to
152 // by stackPtr, initData at stackPtr + 4 bytes, animatingPr just above
153 stackLocs = malloc( 0x100000 ); //1 meg stack -- default Win thread's size
154 stackPtr = ( (char *)stackLocs + 0x100000 - 0x10 );
155 //setup __cdecl on stack -- coreloop will switch to stackPtr before jmp
156 *( (int *)stackPtr + 2 ) = (int) newPr; //rightmost param -- 32bit pointer
157 *( (int *)stackPtr + 1 ) = (int) initialData; //next param to left
158 newPr->stackPtr = stackPtr; //core loop will switch to this, then
159 newPr->framePtr = stackPtr; //suspend loop will save new stack & frame ptr
161 return newPr;
162 }
165 /*This inserts the semantic-layer's data into the standard VMS carrier
166 */
167 inline void
168 VMS__send_sem_request( void *semReqData, VirtProcr *callingPr )
169 { SlaveReqst *req;
171 req = malloc( sizeof(SlaveReqst) );
172 req->slaveFrom = callingPr;
173 req->semReqData = semReqData;
174 req->nextRequest = callingPr->requests;
175 callingPr->requests = req;
176 }
178 /*there is a label inside this function -- save the addr of this label in
179 * the callingPr struc, as the pick-up point from which to start the next
180 * work-unit for that procr. If turns out have to save registers, then
181 * save them in the procr struc too. Then do assembly jump to the CoreLoop's
182 * "done with work-unit" label. The procr struc is in the request in the
183 * slave that animated the just-ended work-unit, so all the state is saved
184 * there, and will get passed along, inside the request handler, to the
185 * next work-unit for that procr.
186 */
187 void
188 VMS__suspend_processor( VirtProcr *callingPr )
189 { void *jmpPt, *stackPtrAddr, *framePtrAddr, *coreLoopStackPtr;
190 void *coreLoopFramePtr;
191 int coreIdx;
193 //The request to master will cause this suspended virt procr to get
194 // scheduled again at some future point -- to resume, core loop jumps
195 // to the resume point (below), which causes restore of saved regs and
196 // "return" from this call.
197 callingPr->nextInstrPt = &&ResumePt;
199 //return ownership of the virt procr and sched slot to Master virt pr
200 callingPr->schedSlot->workIsDone = TRUE;
201 // coreIdx = callingPr->coreAnimatedBy;
203 // stackPtrAddr = &(callingPr->stackPtr);
204 // framePtrAddr = &(callingPr->framePtr);
206 jmpPt = callingPr->coreLoopStartPt;
207 coreLoopFramePtr = callingPr->coreLoopFramePtr;//need this only
208 coreLoopStackPtr = callingPr->coreLoopStackPtr;
209 // coreLoopStackPtr = coreLoopThdParams[ coreIdx ]->stackPtr;//prob dont need
211 //Save the virt procr's stack and frame ptrs, restore coreloop's frame
212 // ptr, then jump back to "start" of core loop
213 asm volatile("movl %%esp, %0; \
214 movl %%ebp, %1; \
215 movl %3, %%eax; \
216 movl %2, %%ebp; \
217 jmp %%eax " \
218 /* outputs */ : "=g" (callingPr->stackPtr), "=g" (callingPr->framePtr) \
219 /* inputs */ : "g"(coreLoopFramePtr), "g" (jmpPt) \
220 /* clobber */ : "memory", "%eax", "%ebx", "%ecx", "%edx", "%edi","%esi" \
221 ); //list everything as clobbered to force GCC to save all
222 // live vars that are in regs on stack before this
223 // assembly, so that stack pointer is correct, before jmp
225 ResumePt:
226 return;
227 }
229 void
230 VMS__dissipate_animating_processor( VirtProcr *animatingPr )
231 {
233 }
235 /*This runs in main thread -- so can only signal to the core loop to shut
236 * itself down --
237 *
238 *Want the master to decide when to shut down -- when semantic layer tells it
239 * to -- say, when all the application-virtual processors have dissipated.
240 *
241 *Maybe return a special code from scheduling plug-in.. master checks and
242 * when sees, it shuts down the core loops -- does this by scheduling a
243 * special virt processor whose next instr pt is the core-end label.
244 */
245 void
246 VMS__shutdown()
247 { int coreIdx;
248 VirtProcr *shutDownPr;
250 //TODO: restore the "orig" stack pointer and frame ptr saved in VMS__start
251 //create a "special" virtual processor, one for each core loop that has
252 // the "loop end" point as its "next instr" point -- when the core loop
253 // jumps to animate the virt procr, the jump lands it at its own
254 // shut-down code.
255 for( coreIdx=0; coreIdx < NUM_CORES; coreIdx++ )
256 {
257 shutDownPr = VMS__create_procr( NULL, NULL );
258 shutDownPr->nextInstrPt = _VMSMasterEnv->coreLoopShutDownPt;
259 }
260 }
264 inline TSCount getTSCount()
265 { unsigned int low, high;
266 TSCount out;
268 saveTimeStampCountInto( low, high );
269 out = high;
270 out = (out << 32) + low;
271 return out;
272 }