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add ProcID function to fetch the procid field of M #15

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add ProcID function to fetch the procid field of M #15

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35 changes: 35 additions & 0 deletions gls/procid.go
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Original file line number Diff line number Diff line change
@@ -0,0 +1,35 @@
package gls

import (
"unsafe"
"github.com/v2pro/plz/reflect2"
)

// offset for go1.19
var mOffset uintptr = 48
var midOffset uintptr = 72

func init() {
gType := reflect2.TypeByName("runtime.g").(reflect2.StructType)
if gType == nil {
panic("failed to get runtime.g type")
}

mField := gType.FieldByName("m")
mOffset = mField.Offset()

mType := reflect2.TypeByName("runtime.m").(reflect2.StructType)
if mType == nil {
panic("failed to get runtime.m type")
}
midField := mType.FieldByName("procid")
midOffset = midField.Offset()
}

// ProcID returns the thread id of current thread
func ProcID() uint64 {
g := getg()
p_m := (*uintptr)(unsafe.Pointer(g + mOffset))
p_mid := (*uint64)(unsafe.Pointer(*p_m + midOffset))
return *p_mid
}