int vtWakeupAll(VtRendez *q) { int i; for(i=0; vtWakeup(q); i++) ; return i; }
void archKick(Arch *a) { if(a == nil){ fprint(2, "warning: archKick nil\n"); return; } vtLock(a->lk); vtWakeup(a->starve); vtUnlock(a->lk); }
void archFree(Arch *a) { /* kill slave */ vtLock(a->lk); a->die = vtRendezAlloc(a->lk); vtWakeup(a->starve); while(a->ref > 1) vtSleep(a->die); vtUnlock(a->lk); vtRendezFree(a->starve); vtRendezFree(a->die); vtLockFree(a->lk); vtMemFree(a); }
static void archThread(void *v) { Arch *a = v; Block *b; Param p; Super super; int ret; u32int addr; uchar rbuf[VtRootSize]; VtRoot root; vtThreadSetName("arch"); for(;;){ /* look for work */ vtLock(a->fs->elk); b = superGet(a->c, &super); if(b == nil){ vtUnlock(a->fs->elk); fprint(2, "archThread: superGet: %R\n"); sleep(60*1000); continue; } addr = super.next; if(addr != NilBlock && super.current == NilBlock){ super.current = addr; super.next = NilBlock; superPack(&super, b->data); blockDirty(b); }else addr = super.current; blockPut(b); vtUnlock(a->fs->elk); if(addr == NilBlock){ /* wait for work */ vtLock(a->lk); vtSleep(a->starve); if(a->die != nil) goto Done; vtUnlock(a->lk); continue; } sleep(10*1000); /* window of opportunity to provoke races */ /* do work */ memset(&p, 0, sizeof p); p.blockSize = a->blockSize; p.dsize = 3*VtEntrySize; /* root has three Entries */ p.c = a->c; p.a = a; ret = archWalk(&p, addr, BtDir, RootTag); switch(ret){ default: abort(); case ArchFailure: fprint(2, "archiveBlock %#ux: %R\n", addr); sleep(60*1000); continue; case ArchSuccess: case ArchFaked: break; } if(0) fprint(2, "archiveSnapshot 0x%#ux: maxdepth %ud nfixed %ud" " send %ud nfailsend %ud nvisit %ud" " nreclaim %ud nfake %ud nreal %ud\n", addr, p.maxdepth, p.nfixed, p.nsend, p.nfailsend, p.nvisit, p.nreclaim, p.nfake, p.nreal); if(0) fprint(2, "archiveBlock %V (%ud)\n", p.score, p.blockSize); /* tie up vac root */ memset(&root, 0, sizeof root); root.version = VtRootVersion; strecpy(root.type, root.type+sizeof root.type, "vac"); strecpy(root.name, root.name+sizeof root.name, "fossil"); memmove(root.score, p.score, VtScoreSize); memmove(root.prev, super.last, VtScoreSize); root.blockSize = a->blockSize; vtRootPack(&root, rbuf); if(!vtWrite(a->z, p.score, VtRootType, rbuf, VtRootSize) || !vtSha1Check(p.score, rbuf, VtRootSize)){ fprint(2, "vtWriteBlock %#ux: %R\n", addr); sleep(60*1000); continue; } /* record success */ vtLock(a->fs->elk); b = superGet(a->c, &super); if(b == nil){ vtUnlock(a->fs->elk); fprint(2, "archThread: superGet: %R\n"); sleep(60*1000); continue; } super.current = NilBlock; memmove(super.last, p.score, VtScoreSize); superPack(&super, b->data); blockDirty(b); blockPut(b); vtUnlock(a->fs->elk); consPrint("archive vac:%V\n", p.score); } Done: a->ref--; vtWakeup(a->die); vtUnlock(a->lk); }