From 47a19e070f57d92aadf52c62361da6ab5397bd4c Mon Sep 17 00:00:00 2001
From: chenshijun <chenshijun@aiotlink.com>
Date: 星期四, 04 六月 2020 16:13:59 +0800
Subject: [PATCH] 将git的shm库变成本地
---
shmwrap.go | 106 ++++++++++++++++++++++++++++++++++++++++++++++++++--
1 files changed, 101 insertions(+), 5 deletions(-)
diff --git a/shmwrap.go b/shmwrap.go
index 2f48b70..a6ae885 100644
--- a/shmwrap.go
+++ b/shmwrap.go
@@ -4,8 +4,10 @@
"context"
"fmt"
"time"
- "github.com/gen2brain/shm"
+ shm "basic.com/valib/goshm.git"
)
+
+const sleepPeriod = time.Duration(5) * time.Millisecond
// NewBlock shm block with size
func NewBlock(size int, key int) ([]byte, int, error) {
@@ -22,6 +24,16 @@
}
return data, id, nil
+}
+
+// NewBlockOnly shm block with size, no attach
+func NewBlockOnly(size int, key int) (int, error) {
+ id, err := shm.Get(key, size, shm.IPC_CREAT|0666)
+ if err != nil || id == -1 {
+ fmt.Printf("NewBlock Get:%x, %v\n", key, err)
+ return -1, err
+ }
+ return id, nil
}
// AttachBlock attach exist shm
@@ -62,7 +74,7 @@
if err == nil {
break loopB
}
- time.Sleep(time.Millisecond)
+ time.Sleep(sleepPeriod)
data, id, err = NewBlock(size, key)
}
}
@@ -83,12 +95,60 @@
if err == nil {
break loopB
}
- time.Sleep(time.Millisecond)
+ time.Sleep(sleepPeriod)
data, id, err = AttachBlock(key)
}
}
}
return data, id
+}
+
+// CreateShmOnly create shm block with size, only space, no padding, return id(int)
+// context for quit
+func CreateShmOnly(ctx context.Context, size int, key int) int {
+ id, err := NewBlockOnly(size, key)
+ if err != nil {
+ loopB:
+ for {
+ select {
+ case <-ctx.Done():
+ return -1
+ default:
+ if err == nil {
+ break loopB
+ }
+ time.Sleep(sleepPeriod)
+ id, err = NewBlockOnly(size, key)
+ }
+ }
+ }
+ return id
+}
+
+// CreateShmOnly create shm block with size, only space, no padding, return id(int)
+// context for quit
+func CreateShmOnlyTime(ctx context.Context, size int, key int, timeout int) int {
+ id, err := NewBlockOnly(size, key)
+ if err != nil {
+ to := time.NewTimer(time.Duration(timeout) * time.Millisecond)
+ defer to.Stop()
+ loopB:
+ for {
+ select {
+ case <-ctx.Done():
+ return -1
+ case <-to.C:
+ return -1
+ default:
+ if err == nil {
+ break loopB
+ }
+ time.Sleep(sleepPeriod)
+ id, err = NewBlockOnly(size, key)
+ }
+ }
+ }
+ return id
}
// CreatePaddingShm create padding shm block with size, return data-with-padding([]byte), id(int)
@@ -107,7 +167,7 @@
} else {
fmt.Println("createShm error:", err)
}
- time.Sleep(time.Millisecond)
+ time.Sleep(sleepPeriod)
data, id, err = NewBlock(size, key)
}
}
@@ -115,6 +175,18 @@
copy(data, padding)
return data, id
+}
+
+// CheckShmExist check if shm is exist or not
+// if exist, return id and true, else return 0 and false
+func CheckShmExist(key int) (int, bool) {
+ id, err := shm.Get(key, 0, 0)
+ if err != nil || id == -1 { //no exist
+ fmt.Printf("AttachBlock Get:%x, %v\n", key, err)
+ return 0, false
+ }
+
+ return id, true
}
// DetachShm destroy
@@ -139,10 +211,11 @@
// RemoveShmKey Remove shmkey
func RemoveShmKey(shmkey int) error {
- _, id, err := AttachBlock(shmkey)
+ d, id, err := AttachBlock(shmkey)
if err != nil {
return err
} else {
+ Detach(d)
return shm.Rm(id)
}
}
@@ -153,6 +226,7 @@
if err != nil {
return err
} else {
+ Detach(d)
return Detach(d)
}
}
@@ -167,3 +241,25 @@
return shm.Rm(id)
}
}
+
+func ShmAttachNum(shmId int) (int,error) {
+ var idDs shm.IdDs
+
+ _, err := shm.Ctl(shmId, shm.IPC_STAT, &idDs)
+ if err != nil {
+ return 0, err
+ }
+
+ return int(idDs.Nattch), nil
+}
+
+func GetKeyById(shmId int) (int,error) {
+ var idDs shm.IdDs
+
+ _, err := shm.Ctl(shmId, shm.IPC_STAT, &idDs)
+ if err != nil {
+ return 0, err
+ }
+
+ return int(idDs.Perm.Key), nil
+}
\ No newline at end of file
--
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