1.易语言暂停多个进程
2.ART 深入浅出 - 为何 Thread.getStackTrace() 会崩溃?
3.ç¨vb6å¯ä¸å¯ä»¥è®¾è®¡å¤çº¿ç¨åºçåºç¨ç¨åºï¼å¦ä½å®ç°
易语言暂停多个进程
OpenProcess 取得 process handle 2.CreateToolhelpSnapshot 得到一个snapshot 3.然后调 ThreadFirst,ThreadNext 取线程
源码:.版本 2.DLL命令 暂停线程, 整数型, "kernel.dll", "SuspendThread" .参数 hThread, 整数型, , 线程句柄.DLL命令 恢复线程, 整数型, "kernel.dll", "ResumeThread", , 解除挂起 .参数 hThread, , , 线程句柄.DLL命令 创建线程, 整数型, "kernel.dll", "CreateThread" .参数 lpThreadAttributes, 整数型 .参数 dwStackSize, 整数型 .参数 子程序指针, 子程序指针 .参数 参数, 整数型 .参数 dwCreationFlags, 整数型 .参数 线程ID, 整数型, 传址.DLL命令 销毁线程, , "kernel.dll", "TerminateThread" .参数 线程ID, 整数型 .参数 dwExitCode, 整数型
ART 深入浅出 - 为何 Thread.getStackTrace() 会崩溃?
ART 深入浅出:Thread.getStackTrace() 崩溃原因剖析
Thread.getStackTrace() 在卡顿检测中常被调用,但频繁调用可能导致崩溃,崩溃堆栈通常显示为:VMStack_getThreadStackTrace() -> ThreadList::SuspendThreadByPeer() 等。本文将逐步解析其崩溃机制。小照云支付源码
在 ART (Android Runtime) 的源码 Android 版本中,VMStack.cc 的 GetThreadStack 函数是关键,它涉及线程挂起和回调生成调用栈的过程。首先,通过 SuspendThreadByPeer() 函数挂起线程,然后回调生成调用栈,最后恢复线程。借款源码然而,这个过程可能因超时引发问题,例如当 SuspendThreadByPeer() 在线程状态检查中判断线程未挂起时,超时会触发 ThreadSuspendByPeerWarning(),严重时会导致 Runtime::Abort。妈妈网源码
通常,使用 ThreadList::SuspendThreadByThreadId() 函数可以避免这种 Crash,因为它在超时后只会产生警告,而不是终止。超时时间默认为 秒,人人贷源码如果线程长时间未能挂起,可能源于 ART 挂起线程的机制。在旧版 ART 中,挂起线程通过 ModifySuspendCount() 函数设置标志位,但在新版本中,微预订源码这个逻辑已有所改变。
深入探究,Java 的 Check Point 概念在其中起关键作用。解释执行的 switch/case 语句和机器码执行都有检查点,这些检查点会暂停线程执行,进行垃圾回收、调试等操作。当 Thread.getStackTrace() 触发挂起时,会进入 CheckSuspend() 函数,依据状态标志位决定挂起或执行检查点。真正的挂起操作会在析构函数中执行,通过 wait 函数挂起线程,直到其他线程执行到唤醒操作。
总结来说,Thread.getStackTrace() 崩溃源于线程挂起操作与检查点执行的同步问题。当线程未能及时进入检查点,getStackTrace() 的等待时间过长,从而导致崩溃。理解了这个机制,就能避免此类问题的发生。
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Option Explicit
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Private Sub Command1_Click()
On Error Resume Next
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.ThreadEnabled = True
End With
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.Initialize AddressOf Fillright
.ThreadEnabled = True
End With
With myThreadbottom
.Initialize AddressOf Fillbottom
.ThreadEnabled = True
End With
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Set myThreadleft = Nothing
Set myThreadright = Nothing
Set myThreadbottom = Nothing
End Sub
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Private Sub Command2_Click()
Unload Me
End Sub
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Option Explicit
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Private Declare Function GetTickCount Lib "kernel" () As Long
'声æcls_threadç±»ç对象åé
Public myThreadleft As New cls_thread, myThreadright As New cls_thread, myThreadbottom As New cls_thread
Sub Main()
Load Form1
Form1.Show
End Sub
Public Sub Fillleft()
Static Bkgcolor As Long
Dim LongTick As Long, Longcounter As Long
On Error Resume Next
For Longcounter = 0 To
DoEvents
Bkgcolor = Longcounter Mod
Form1.Picture1.BackColor = RGB(Bkgcolor, 0, 0)
LongTick = GetTickCount
While GetTickCount - LongTick < '延æ¶æ¯«ç§,ä¸å
Wend
Next
Set myThreadleft = Nothing 'å¦æ循ç¯ç»æåç»æ¢å½å线ç¨è¿è¡ï¼ä¸å
End Sub
Public Sub Fillright()
Static Bkgcolor As Long
Dim LongTickValue As Long, Longcounter As Long
On Error Resume Next
For Longcounter = 0 To
DoEvents
Bkgcolor = Longcounter Mod
Form1.Picture2.BackColor = RGB(0, Bkgcolor, 0)
LongTickValue = GetTickCount
While GetTickCount - LongTickValue <
Wend
Next
Set myThreadright = Nothing
End Sub
Public Sub Fillbottom()
Static Bkgcolor As Long
Dim LongTick As Long, Longcounter As Long
On Error Resume Next
For Longcounter = 0 To
DoEvents
Bkgcolor = Longcounter Mod
Form1.Picture3.BackColor = RGB(0, 0, Bkgcolor)
LongTick = GetTickCount
While GetTickCount - LongTick <
Wend
Next
Set myThreadright = Nothing
End Sub
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'åè½ï¼å建å¤çº¿ç¨ç±»ï¼ç¨äºåå§å线ç¨ã ç±»åï¼cls_Thread
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' End With
' 3.ç»æ¢è°ç¨ï¼ Set mythread = Nothing
' Crate By : éå® On .5. Copyright(C).Ldt By CY-soft --
' Email:4y4ycoco@.com
' Test Onï¼ VB6.0+Win AND VB6.0+WinXP It's Pass ï¼
Option Explicit
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Private Declare Function CreateThread Lib "kernel" (ByVal lpThreadAttributes As Any, ByVal dwStackSize As Long, ByVal lpStartAddress As Long, lpParameter As Any, ByVal dwCreationFlags As Long, LpthreadId As Long) As Long
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Private Declare Function TerminateThread Lib "kernel" (ByVal hThread As Long, ByVal dwExitCode As Long) As Long
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Private Declare Function ResumeThread Lib "kernel" (ByVal hThread As Long) As Long
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Private Declare Function SuspendThread Lib "kernel" (ByVal hThread As Long) As Long
Private Const CREATE_SUSPENDED = &H4 '线ç¨æ起常é
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Private Type udtThread
Handle As Long
Enabled As Boolean
End Type
Private meTheard As udtThread
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Public Sub Initialize(ByVal LongPointFunction As Long)
Dim LongStackSize As Long, LongCreationFlags As Long, LpthreadId As Long, LongNull As Long
On Error Resume Next
LongNull = 0
LongStackSize = 0
LongCreationFlags = CREATE_SUSPENDED 'å建线ç¨åå æèµ·ï¼ç±ç¨åºæ¿æ´»çº¿ç¨
'å建线ç¨å¹¶è¿çº¿ç¨å¥æ
meTheard.Handle = CreateThread(LongNull, LongStackSize, ByVal LongPointFunction, LongNull, LongCreationFlags, LpthreadId)
If meTheard.Handle = LongNull Then
MsgBox "线ç¨å建失败ï¼", , "é误"
End If
End Sub
'è·å线ç¨æ¯å¦æ¿æ´»å±æ§
Public Property Get ThreadEnabled() As Boolean
On Error Resume Next
Enabled = meTheard.Enabled
End Property
'设置线ç¨æ¯å¦æ¿æ´»å±æ§
Public Property Let ThreadEnabled(ByVal Newvalue As Boolean)
On Error Resume Next
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If Newvalue And (Not meTheard.Enabled) Then
ResumeThread meTheard.Handle
meTheard.Enabled = True
Else 'è¥æ¿æ´»çº¿ç¨ï¼Newvalue为çï¼ä¸æ¤çº¿ç¨åæ¥å·²æ¿æ´»åæèµ·æ¤çº¿ç¨
If meTheard.Enabled Then
SuspendThread meTheard.Handle
meTheard.Enabled = False
End If
End If
End Property
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Private Sub Class_Terminate()
On Error Resume Next
Call TerminateThread(meTheard.Handle, 0)
End Sub