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-rw-r--r--src/kernel/ipc/request.c253
1 files changed, 0 insertions, 253 deletions
diff --git a/src/kernel/ipc/request.c b/src/kernel/ipc/request.c
deleted file mode 100644
index 7fe8f2b..0000000
--- a/src/kernel/ipc/request.c
+++ /dev/null
@@ -1,253 +0,0 @@
-#include "request.h"
-#include "shm.h"
-#include "object.h"
-#include <lib/mutex.h>
-#include <mem/seg.h>
-#include <mem/mem.h>
-
-int request_get(int id, uint32_t ptr, int wait) {
- int i;
- //check if we own the object, if not return -2 (-10 if descriptor does not exist)
- struct object *obj = objdesc_read(current_thread->process, id);
- if (obj == 0) return -10;
- if (obj->owner != current_thread->process) return -2;
- //check if a request is pending. if request is being processed (acknowledged), return -3
- if (obj->request != 0 && obj->request->acknowledged != RS_PENDING) return -3;
- //if not (busymutex unlocked and request==0) && wait, then wait, else return -1
- if (wait == 0 && obj->request == 0) return -1;
- while (obj->busyMutex != MUTEX_LOCKED && (obj->request == 0 || obj->request->acknowledged != RS_PENDING)) {
- //set thread to be waked up on request
- obj->wakeupOnRq = current_thread;
- //go to sleep
- thread_goInactive();
- }
- obj->request->acknowledged = RS_PROCESSED;
- //when request pending (wait finished), write it to ptr
- struct user_request *p = (struct user_request*)ptr;
- p->func = obj->request->func;
- for (i = 0; i < 3; i++) {
- p->params[i] = obj->request->params[i];
- p->shmsize[i] = obj->request->shmsize[i];
- }
- p->isBlocking = (obj->request->requester != 0);
- p->pid = obj->request->pid;
- //if request is nonblocking and no shm is to be mapped, delete request and unlock objects busymutex, else set it to acknowledged
- if (p->isBlocking) return 0;
- for (i = 0; i < 3; i++) {
- if (obj->request->shm_sndr[i] != 0) return 0;
- }
- kfree(obj->request);
- obj->request = 0;
- mutex_unlock(&obj->busyMutex);
- return 0;
-}
-
-int request_has(int id) {
- //check if we own the object, if not return -2 (-10 if descriptor does not exist)
- struct object *obj = objdesc_read(current_thread->process, id);
- if (obj == 0) return -10;
- if (obj->owner != current_thread->process) return -2;
- //check if a request is pending.
- // if none (busymutex unlocked or request==0), return 0
- if (obj->request == 0 || obj->busyMutex == MUTEX_UNLOCKED) return 0;
- // if waiting for ack (not acknowledged), return 1
- if (obj->request->acknowledged == RS_PENDING) return 1;
- // if being processed (acknowledged), return 2
- return 2;
-}
-
-void request_answer(int id, uint32_t answer, uint32_t answer2, int errcode) {
- int i;
- //check if we own the object, if not return (also return if descriptor does not exist)
- struct object *obj = objdesc_read(current_thread->process, id);
- if (obj == 0) return;
- if (obj->owner != current_thread->process) return;
- //if no blocking request is being processed (including non-acknowledged waiting requests), return
- if (obj->request == 0 || obj->request->acknowledged == RS_PENDING || obj->request->requester == 0) return;
- //unmap shared memory segments from shm_rcv, close descriptors to objects from obj_close
- for (i = 0; i < 3; i++) {
- if (obj->request->shm_rcv[i] != 0) seg_unmap(obj->request->shm_rcv[i]);
- if (obj->request->obj_close[i] != 0) obj_closeP(obj->owner, obj->request->obj_close[i]);
- }
- //set blocking request to finished (acknowledged = 2), and set its answer
- obj->request->acknowledged = RS_FINISHED;
- switch (obj->request->func >> 30) {
- case PT_OBJDESC:
- if ((int)answer < 0) {
- obj->request->answer.n = answer;
- } else {
- if (obj->owner == obj->request->requester->process) {
- obj->request->answer.n = answer;
- } else {
- struct object *o = objdesc_read(obj->owner, answer);
- int n = -1;
- if (o != 0) {
- n = objdesc_get(obj->request->requester->process, o);
- if (n == -1) {
- n = objdesc_add(obj->request->requester->process, o);
- }
- }
- obj->request->answer.n = n;
- }
- }
- break;
- case PT_LONG:
- obj->request->answer.n = answer;
- break;
- case PT_LONGLONG:
- obj->request->answer.ll = (uint64_t)((uint64_t)answer2 << 32) | answer;
- }
- obj->request->errcode = errcode;
- //wake up receiver thread (thread_wakeUp)
- thread_wakeUp(obj->request->requester);
- //dereference request from object, unlock objects busymutex
- obj->request = 0;
- mutex_unlock(&obj->busyMutex);
-}
-
-int request_mapShm(int id, uint32_t pos, int number) {
- int i;
- if (number > 2 || number < 0) return -9;
- //check if we own the object, if not return -2 (-10 if descriptor does not exist)
- struct object *obj = objdesc_read(current_thread->process, id);
- if (obj == 0) return -10;
- if (obj->owner != current_thread->process) return -2;
- //if no request is being processes (including non-acknowledged waiting requests), return -3
- if (obj->request == 0 || obj->request->acknowledged == RS_PENDING) return -3;
- //check if the requests should have shm in parameter [number], if not return -4
- int n = (obj->request->func >> (28 - (2 * number))) & 3;
- if (n != PT_SHM) return -4;
- //check if sender process is different from receiver process, if not return -7
- if (obj->request->requester != 0 && obj->owner == obj->request->requester->process) return -7;
- //check if sender sent a shm seg in parameter [number], if not return -5
- if (obj->request->shm_sndr[number] == 0) return -5;
- //map shm to position
- obj->request->shm_rcv[number] = seg_map(obj->request->shm_sndr[number]->seg, obj->owner->pagedir, pos);
- obj->request->shm_sndr[number]->seg->mappings--;
- //if request is nonblocking and no more shm is to be mapped, delete request and free object busymutex
- if (obj->request->requester != 0) return 0;
- for (i = 0; i < 3; i++) {
- if (obj->request->shm_sndr[i] != 0 && obj->request->shm_rcv[i] == 0) return 0;
- }
- kfree(obj->request);
- obj->request = 0;
- mutex_unlock(&obj->busyMutex);
- return 0;
-}
-
-static struct request *mkrequest(int id, struct thread *requester,
- uint32_t func, uint32_t a, uint32_t b, uint32_t c, uint32_t *err) {
- int i;
- // get object from descriptor id, if none return 0
- struct object *obj = objdesc_read(current_thread->process, id);
- if (obj == 0) {
- *err = -10;
- return 0;
- }
- // waitlock object's busy mutex
- mutex_lock(&obj->busyMutex);
- // if object cannot answer (owner == 0) return 0
- if (obj->owner == 0) {
- mutex_unlock(&obj->busyMutex);
- *err = -11;
- return 0;
- }
- // create request, fill it up :
- struct request *rq = kmalloc(sizeof(struct request));
- rq->obj = obj;
- rq->requester = requester;
- rq->func = func;
- for (i = 0; i < 3; i++) { rq->params[i] = 0; rq->obj_close[i] = 0; rq->shm_sndr[i] = 0; rq->shm_rcv[i] = 0; }
- rq->acknowledged = RS_PENDING;
- rq->pid = current_thread->process->pid;
- // integers: use as is
- // objects: open a new descriptor in receiver process (if same process, keep number), put that number as an int
- // if receiver already had descriptor to this object, use it and set obj_close to 0, else set obj_close to new number
- // shm: if same process, put ptr as int, else put 0 as int and get segment_map to shm_sndr
- // objects and shm: 0 means sender didn't want to share anything, that should stay 0.
- for (i = 0; i < 3; i++) {
- int n = (rq->func >> (28 - (2 * i))) & 3;
- uint32_t v = (i == 0 ? a : (i == 1 ? b : c));
- switch (n) {
- case PT_OBJDESC:
- if ((int)v < 0) {
- rq->params[i] = v;
- } else {
- if (obj->owner == current_thread->process) {
- rq->params[i] = v;
- } else {
- int d = objdesc_get(obj->owner, objdesc_read(current_thread->process, v));
- if (d == -1) {
- d = objdesc_add(obj->owner, objdesc_read(current_thread->process, v));
- rq->obj_close[i] = d;
- }
- rq->params[i] = d;
- }
- }
- break;
- case PT_LONG:
- rq->params[i] = v;
- break;
- case PT_SHM:
- rq->shmsize[i] = 0;
- if (obj->owner == current_thread->process) {
- rq->params[i] = v;
- struct segment_map *t = shmseg_getByOff(current_thread->process, v);
- if (t != 0) rq->shmsize[i] = t->len;
- } else {
- rq->shm_sndr[i] = shmseg_getByOff(current_thread->process, v);
- rq->shm_sndr[i]->seg->mappings++;
- if (rq->shm_sndr[i] != 0) rq->shmsize[i] = rq->shm_sndr[i]->len;
- }
- break;
- }
- }
- // reference request from object
- obj->request = rq;
- if (obj->wakeupOnRq != 0) {
- thread_wakeUp(obj->wakeupOnRq);
- obj->wakeupOnRq = 0;
- }
- // return request
- return rq;
-}
-
-int request(int obj, uint32_t rq_ptr) {
- uint32_t e = 0;
-
- struct user_sendrequest *urq = (void*)rq_ptr;
- //call mkrequest with parameters (requester thread = current thread)
- struct request *rq = mkrequest(obj, current_thread, urq->func, urq->a, urq->b, urq->c, &e);
- //if returned value is 0 (could not create request), return -1
- if (e != 0) return e;
- if (rq == 0) return -1;
- //sleep until request is handled
- thread_goInactive();
- //if request has been interrupted because process closed communication (acknowledged == 3), return -2
- if (rq->acknowledged == 3) return -2;
- //write answer to urq, delete request, return 0
- switch (urq->func >> 30) {
- case PT_OBJDESC:
- case PT_LONG:
- urq->answeri = rq->answer.n;
- break;
- case PT_LONGLONG:
- urq->answerll = rq->answer.ll;
- }
- urq->errcode = rq->errcode;
- kfree(rq);
- return 0;
-}
-
-int send_msg(int obj, uint32_t rq_ptr) {
- uint32_t e = 0;
-
- struct user_sendrequest *urq = (void*)rq_ptr;
- //call mkrequest with parameters (requester thread = 0)
- struct request *rq = mkrequest(obj, 0, urq->func, urq->a, urq->b, urq->c, &e);
- //if returned value is 0, return -1 else return 0
- if (e != 0) return e;
- if (rq == 0) return -1;
- urq->errcode = 0;
- return 0;
-}
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