lib/sync: a wrapper for inserting go-deadlock into the rclone build

lib/sync/deadlock.go

@@ -0,0 +1,68 @@
+//go:build deadlock
+// +build deadlock
+
+package sync
+
+import (
+	"sync"
+
+	"github.com/sasha-s/go-deadlock"
+)
+
+type (
+	// Cond implements a condition variable, a rendezvous point
+	// for goroutines waiting for or announcing the occurrence
+	// of an event.
+	//
+	// For full docs see the standard library sync docs
+	Cond = sync.Cond
+
+	// A Locker represents an object that can be locked and unlocked.
+	//
+	// For full docs see the standard library sync docs
+	Locker = sync.Locker
+
+	// Map is like a Go map[interface{}]interface{} but is safe for concurrent use
+	// by multiple goroutines without additional locking or coordination.
+	// Loads, stores, and deletes run in amortized constant time.
+	//
+	// For full docs see the standard library sync docs
+	Map = sync.Map
+
+	// A Mutex is a mutual exclusion lock.
+	//
+	// For full docs see the standard library sync docs
+	Mutex = deadlock.Mutex
+
+	// Once is an object that will perform exactly one action.
+	//
+	// For full docs see the standard library sync docs
+	Once = sync.Once
+
+	// A Pool is a set of temporary objects that may be individually saved and
+	// retrieved.
+	//
+	// For full docs see the standard library sync docs
+	Pool = sync.Pool
+
+	// A RWMutex is a reader/writer mutual exclusion lock.
+	// The lock can be held by an arbitrary number of readers or a single writer.
+	// The zero value for a RWMutex is an unlocked mutex.
+	//
+	// For full docs see the standard library sync docs
+	RWMutex = deadlock.RWMutex
+
+	// A WaitGroup waits for a collection of goroutines to finish.
+	// The main goroutine calls Add to set the number of
+	// goroutines to wait for. Then each of the goroutines
+	// runs and calls Done when finished. At the same time,
+	// Wait can be used to block until all goroutines have finished.
+	//
+	// For full docs see the standard library sync docs
+	WaitGroup = sync.WaitGroup
+)
+
+var (
+	// NewCond returns a new Cond with Locker l.
+	NewCond = sync.NewCond
+)

lib/sync/sync.go

@@ -0,0 +1,64 @@
+//go:build !deadlock
+// +build !deadlock
+
+package sync
+
+import "sync"
+
+type (
+	// Cond implements a condition variable, a rendezvous point
+	// for goroutines waiting for or announcing the occurrence
+	// of an event.
+	//
+	// For full docs see the standard library sync docs
+	Cond = sync.Cond
+
+	// A Locker represents an object that can be locked and unlocked.
+	//
+	// For full docs see the standard library sync docs
+	Locker = sync.Locker
+
+	// Map is like a Go map[interface{}]interface{} but is safe for concurrent use
+	// by multiple goroutines without additional locking or coordination.
+	// Loads, stores, and deletes run in amortized constant time.
+	//
+	// For full docs see the standard library sync docs
+	Map = sync.Map
+
+	// A Mutex is a mutual exclusion lock.
+	//
+	// For full docs see the standard library sync docs
+	Mutex = sync.Mutex
+
+	// Once is an object that will perform exactly one action.
+	//
+	// For full docs see the standard library sync docs
+	Once = sync.Once
+
+	// A Pool is a set of temporary objects that may be individually saved and
+	// retrieved.
+	//
+	// For full docs see the standard library sync docs
+	Pool = sync.Pool
+
+	// A RWMutex is a reader/writer mutual exclusion lock.
+	// The lock can be held by an arbitrary number of readers or a single writer.
+	// The zero value for a RWMutex is an unlocked mutex.
+	//
+	// For full docs see the standard library sync docs
+	RWMutex = sync.RWMutex
+
+	// A WaitGroup waits for a collection of goroutines to finish.
+	// The main goroutine calls Add to set the number of
+	// goroutines to wait for. Then each of the goroutines
+	// runs and calls Done when finished. At the same time,
+	// Wait can be used to block until all goroutines have finished.
+	//
+	// For full docs see the standard library sync docs
+	WaitGroup = sync.WaitGroup
+)
+
+var (
+	// NewCond returns a new Cond with Locker l.
+	NewCond = sync.NewCond
+)