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-rw-r--r--core/chain_pow.go87
1 files changed, 87 insertions, 0 deletions
diff --git a/core/chain_pow.go b/core/chain_pow.go
new file mode 100644
index 000000000..c3b5788c1
--- /dev/null
+++ b/core/chain_pow.go
@@ -0,0 +1,87 @@
+// Copyright 2015 The go-ethereum Authors
+// This file is part of the go-ethereum library.
+//
+// The go-ethereum library is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// The go-ethereum library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
+
+package core
+
+import (
+ "runtime"
+
+ "github.com/ethereum/go-ethereum/core/types"
+ "github.com/ethereum/go-ethereum/pow"
+)
+
+// nonceCheckResult contains the result of a nonce verification.
+type nonceCheckResult struct {
+ index int // Index of the item verified from an input array
+ valid bool // Result of the nonce verification
+}
+
+// verifyNoncesFromHeaders starts a concurrent header nonce verification,
+// returning a quit channel to abort the operations and a results channel
+// to retrieve the async verifications.
+func verifyNoncesFromHeaders(checker pow.PoW, headers []*types.Header) (chan<- struct{}, <-chan nonceCheckResult) {
+ items := make([]pow.Block, len(headers))
+ for i, header := range headers {
+ items[i] = types.NewBlockWithHeader(header)
+ }
+ return verifyNonces(checker, items)
+}
+
+// verifyNoncesFromBlocks starts a concurrent block nonce verification,
+// returning a quit channel to abort the operations and a results channel
+// to retrieve the async verifications.
+func verifyNoncesFromBlocks(checker pow.PoW, blocks []*types.Block) (chan<- struct{}, <-chan nonceCheckResult) {
+ items := make([]pow.Block, len(blocks))
+ for i, block := range blocks {
+ items[i] = block
+ }
+ return verifyNonces(checker, items)
+}
+
+// verifyNonces starts a concurrent nonce verification, returning a quit channel
+// to abort the operations and a results channel to retrieve the async checks.
+func verifyNonces(checker pow.PoW, items []pow.Block) (chan<- struct{}, <-chan nonceCheckResult) {
+ // Spawn as many workers as allowed threads
+ workers := runtime.GOMAXPROCS(0)
+ if len(items) < workers {
+ workers = len(items)
+ }
+ // Create a task channel and spawn the verifiers
+ tasks := make(chan int, workers)
+ results := make(chan nonceCheckResult, len(items)) // Buffered to make sure all workers stop
+ for i := 0; i < workers; i++ {
+ go func() {
+ for index := range tasks {
+ results <- nonceCheckResult{index: index, valid: checker.Verify(items[index])}
+ }
+ }()
+ }
+ // Feed item indices to the workers until done or aborted
+ abort := make(chan struct{})
+ go func() {
+ defer close(tasks)
+
+ for i := range items {
+ select {
+ case tasks <- i:
+ continue
+ case <-abort:
+ return
+ }
+ }
+ }()
+ return abort, results
+}