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shm.go
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shm.go
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package shm
//#include "shm.h"
import "C"
import (
"os"
"reflect"
"unsafe"
"github.com/Ptt-official-app/go-pttbbs/types"
log "github.com/sirupsen/logrus"
)
func CreateShm(key types.Key_t, size types.Size_t, isUseHugeTlb bool) (shmid int, shmaddr unsafe.Pointer, isNew bool, err error) {
flags := 0o600 | IPC_CREAT | IPC_EXCL
if isUseHugeTlb {
flags |= SHM_HUGETLB
}
shmid, err = shmget(key, size, flags)
log.Debugf("shm.CreateShm: after 1st shmget: shmid: %v err: (%v/%v)", shmid, err, reflect.TypeOf(err))
isEExist := false
if os.IsExist(err) {
isEExist = true
flags = 0o600 | IPC_CREAT
if isUseHugeTlb {
flags |= SHM_HUGETLB
}
shmid, err = shmget(key, size, flags)
log.Debugf("shm.CreateShm: after 2nd shmget: shmid: %v err: (%v/%v)", shmid, err, reflect.TypeOf(err))
}
if shmid < 0 {
log.Errorf("shm.CreateShm: unable to create shm: key: %v size: %v", key, size)
return shmid, nil, false, err
}
shmaddr, err = shmat(shmid, nil, 0)
log.Infof("shm.CreateShm: after shmat: shmaddr: %v e: %v", shmaddr, err)
if err != nil {
return -1, nil, false, err
}
return shmid, shmaddr, !isEExist, nil
}
func OpenShm(key types.Key_t, size types.Size_t, is_usehugetlb bool) (shmid int, shmaddr unsafe.Pointer, err error) {
flags := 0
if is_usehugetlb {
flags |= SHM_HUGETLB
}
shmid, err = shmget(key, size, flags)
if err != nil {
log.Errorf("shm.OpenShm: unable to create shm: key: %v size: %v", key, size)
return shmid, nil, err
}
shmaddr, err = shmat(shmid, nil, 0)
if err != nil {
return -1, nil, err
}
return shmid, shmaddr, nil
}
func CloseShm(shmid int, shmaddr unsafe.Pointer) (err error) {
cret, err := C.shmdt(shmaddr)
log.Infof("shm.CloseShm: After detach shm: shmaddr: %v ret: %v err: %v", shmaddr, cret, err)
if err != nil {
return err
}
cret, err = C.shmctl(C.int(shmid), C.IPC_RMID, nil)
log.Infof("shm.CloseShm: After close shm: shmaddr: %v ret: %v, err: %v", shmaddr, cret, err)
if int(cret) < 0 {
return ErrUnableToCloseShm
}
return nil
}
func shmget(key types.Key_t, size types.Size_t, shmflg int) (int, error) {
cshmid, err := C.shmget(C.int(key), C.ulong(size), C.int(shmflg))
shmid := int(cshmid)
if shmid < 0 {
log.Errorf("unable to shmget: shmid: %v e: %v", shmid, err)
}
return shmid, err
}
func shmat(shmid int, shmaddr unsafe.Pointer, shmflg int) (unsafe.Pointer, error) {
newShmAddr, err := C.shmat(C.int(shmid), shmaddr, C.int(shmflg))
if err != nil {
return nil, err
}
return newShmAddr, nil
}