lib: Removed the surely redundant struct timeentry from the mtio-epoll.

[ashd.git] / lib / mtio-epoll.c

diff --git a/lib/mtio-epoll.c b/lib/mtio-epoll.c
index 72468e0..a0b2f41 100644 (file)
--- a/lib/mtio-epoll.c
+++ b/lib/mtio-epoll.c
@@ -37,7 +37,8 @@ static struct blocker *blockers;
 struct blocker {
     struct blocker *n, *p, *n2, *p2;
     int fd, reg;
-    int ev;
+    int ev, rev, id;
+    int thpos;
     time_t to;
     struct muth *th;
 };
@@ -45,6 +46,7 @@ struct blocker {
 static int epfd = -1, fdln = 0;
 static int exitstatus;
 static struct blocker **fdlist;
+static typedbuf(struct blocker *) timeheap;
 
 static int regfd(struct blocker *bl)
 {
@@ -129,34 +131,134 @@ static void remfd(struct blocker *bl)
     bl->reg = 0;
 }
 
-int block(int fd, int ev, time_t to)
+static void thraise(struct blocker *bl, int n)
 {
-    struct blocker *bl;
-    int rv;
+    int p;
     
-    omalloc(bl);
-    bl->fd = fd;
-    bl->ev = ev;
-    if(to > 0)
-       bl->to = time(NULL) + to;
-    bl->th = current;
-    if((epfd >= 0) && regfd(bl)) {
-       free(bl);
-       return(-1);
+    while(n > 0) {
+       p = (n - 1) >> 1;
+       if(timeheap.b[p]->to <= bl->to)
+           break;
+       timeheap.b[n] = timeheap.b[p];
+       timeheap.b[n]->thpos = n;
+       n = p;
+    }
+    timeheap.b[n] = bl;
+    bl->thpos = n;
+}
+
+static void thlower(struct blocker *bl, int n)
+{
+    int c;
+    
+    while(1) {
+       c = (n << 1) + 1;
+       if(c >= timeheap.d)
+           break;
+       if((c + 1 < timeheap.d) && (timeheap.b[c + 1]->to < timeheap.b[c]->to))
+           c = c + 1;
+       if(timeheap.b[c]->to > bl->to)
+           break;
+       timeheap.b[n] = timeheap.b[c];
+       timeheap.b[n]->thpos = n;
+       n = c;
     }
+    timeheap.b[n] = bl;
+    bl->thpos = n;
+}
+
+static void addtimeout(struct blocker *bl, time_t to)
+{
+    sizebuf(timeheap, ++timeheap.d);
+    thraise(bl, timeheap.d - 1);
+}
+
+static void deltimeout(struct blocker *bl)
+{
+    int n;
+    
+    if(bl->thpos == timeheap.d - 1) {
+       timeheap.d--;
+       return;
+    }
+    n = bl->thpos;
+    bl = timeheap.b[--timeheap.d];
+    if((n > 0) && (timeheap.b[(n - 1) >> 1]->to > bl->to))
+       thraise(bl, n);
+    else
+       thlower(bl, n);
+}
+
+static int addblock(struct blocker *bl)
+{
+    if((epfd >= 0) && regfd(bl))
+       return(-1);
     bl->n = blockers;
     if(blockers)
        blockers->p = bl;
     blockers = bl;
-    rv = yield();
+    if(bl->to > 0)
+       addtimeout(bl, bl->to);
+    return(0);
+}
+
+static void remblock(struct blocker *bl)
+{
+    if(bl->to > 0)
+       deltimeout(bl);
     if(bl->n)
        bl->n->p = bl->p;
     if(bl->p)
        bl->p->n = bl->n;
-    if(bl == blockers)
+    if(blockers == bl)
        blockers = bl->n;
     remfd(bl);
-    free(bl);
+}
+
+struct selected mblock(time_t to, int n, struct selected *spec)
+{
+    int i, id;
+    struct blocker bls[n];
+    
+    to = (to > 0)?(time(NULL) + to):0;
+    for(i = 0; i < n; i++) {
+       bls[i] = (struct blocker) {
+           .fd = spec[i].fd,
+           .ev = spec[i].ev,
+           .id = i,
+           .to = to,
+           .th = current,
+       };
+       if(addblock(&bls[i])) {
+           for(i--; i >= 0; i--)
+               remblock(&bls[i]);
+           return((struct selected){.fd = -1, .ev = -1});
+       }
+    }
+    id = yield();
+    for(i = 0; i < n; i++)
+       remblock(&bls[i]);
+    if(id < 0)
+       return((struct selected){.fd = -1, .ev = -1});
+    return((struct selected){.fd = bls[id].fd, .ev = bls[id].rev});
+}
+
+int block(int fd, int ev, time_t to)
+{
+    struct blocker bl;
+    int rv;
+    
+    bl = (struct blocker) {
+       .fd = fd,
+       .ev = ev,
+       .id = -1,
+       .to = (to > 0)?(time(NULL) + to):0,
+       .th = current,
+    };
+    if(addblock(&bl))
+       return(-1);
+    rv = yield();
+    remblock(&bl);
     return(rv);
 }
 
@@ -165,27 +267,23 @@ int ioloop(void)
     struct blocker *bl, *nbl;
     struct epoll_event evr[16];
     int i, fd, nev, ev, toval;
-    time_t now, timeout;
+    time_t now;
     
     exitstatus = 0;
     epfd = epoll_create(128);
     fcntl(epfd, F_SETFD, FD_CLOEXEC);
+    bufinit(timeheap);
     for(bl = blockers; bl; bl = nbl) {
        nbl = bl->n;
        if(regfd(bl))
            resume(bl->th, -1);
     }
     while(blockers != NULL) {
-       timeout = 0;
-       for(bl = blockers; bl; bl = bl->n) {
-           if((bl->to != 0) && ((timeout == 0) || (timeout > bl->to)))
-               timeout = bl->to;
-       }
        now = time(NULL);
-       if(timeout == 0)
+       if(timeheap.d == 0)
            toval = -1;
-       else if(timeout > now)
-           toval = (timeout - now) * 1000;
+       else if(timeheap.b[0]->to > now)
+           toval = (timeheap.b[0]->to - now) * 1000;
        else
            toval = 1000;
        if(exitstatus)
@@ -211,19 +309,29 @@ int ioloop(void)
                ev = -1;
            for(bl = fdlist[fd]; bl; bl = nbl) {
                nbl = bl->n2;
-               if((ev < 0) || (ev & bl->ev))
-                   resume(bl->th, ev);
+               if((ev < 0) || (ev & bl->ev)) {
+                   if(bl->id < 0) {
+                       resume(bl->th, ev);
+                   } else {
+                       bl->rev = ev;
+                       resume(bl->th, bl->id);
+                   }
+               }
            }
        }
        now = time(NULL);
-       for(bl = blockers; bl; bl = nbl) {
-           nbl = bl->n;
-           if((bl->to != 0) && (bl->to <= now))
+       while((timeheap.d > 0) && ((bl = timeheap.b[0])->to <= now)) {
+           if(bl->id < 0) {
                resume(bl->th, 0);
+           } else {
+               bl->rev = 0;
+               resume(bl->th, bl->id);
+           }
        }
     }
     for(bl = blockers; bl; bl = bl->n)
        remfd(bl);
+    buffree(timeheap);
     close(epfd);
     epfd = -1;
     return(exitstatus);