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//go:build windows
// +build windows
package etw
import (
"sync"
)
// Because the provider callback function needs to be able to access the
// provider data when it is invoked by ETW, we need to keep provider data stored
// in a global map based on an index. The index is passed as the callback
// context to ETW.
type providerMap struct {
m map[uint]*Provider
i uint
lock sync.Mutex
}
var providers = providerMap{
m: make(map[uint]*Provider),
}
func (p *providerMap) newProvider() *Provider {
p.lock.Lock()
defer p.lock.Unlock()
i := p.i
p.i++
provider := &Provider{
index: i,
}
p.m[i] = provider
return provider
}
func (p *providerMap) removeProvider(provider *Provider) {
p.lock.Lock()
defer p.lock.Unlock()
delete(p.m, provider.index)
}
func (p *providerMap) getProvider(index uint) *Provider {
p.lock.Lock()
defer p.lock.Unlock()
return p.m[index]
}
//todo: combine these into struct, so that "globalProviderCallback" is guaranteed to be initialized through method access
var providerCallbackOnce sync.Once
var globalProviderCallback uintptr
|
