- lib: add Win function to suspend or resume all threads in a process

svn path=/trunk/boinc/; revision=14863

checkin_notes

@@ -2007,3 +2007,9 @@ Rytis   6 Mar 2008
             forum.inc
         languages/
             en.po
+
+David  6 Mar 2008
+    - lib: add Win function to suspend or resume all threads in a process
+
+    lib
+        win_util.C,h

lib/win_util.C

@@ -767,3 +767,30 @@ GetAccountSid(
     return bSuccess;
 }
 
+// Suspend or resume the threads in a given process.
+// The only way to do this on Windows is to enumerate
+// all the threads in the entire system,
+// and find those belonging to the process (ugh!!)
+//
+int suspend_or_resume_threads(DWORD pid, bool resume) { 
+    HANDLE threads, thread;
+    THREADENTRY32 te = {0}; 
+ 
+    threads = CreateToolhelp32Snapshot(TH32CS_SNAPTHREAD, 0); 
+    if (threads == INVALID_HANDLE_VALUE) return -1;
+ 
+    te.dwSize = sizeof(THREADENTRY32); 
+    if (!Thread32First(threads, &te)) { 
+        CloseHandle(threads); 
+        return -1;
+    }
+    do { 
+        if (te.th32OwnerProcessID == pid) {
+            thread = OpenThread(THREAD_SUSPEND_RESUME, FALSE, te.th32ThreadID);
+            resume ?  ResumeThread(thread) : SuspendThread(thread);
+            CloseHandle(thread);
+        } 
+    } while (Thread32Next(threads, &te)); 
+    CloseHandle (threads); 
+    return 0;
+} 

lib/win_util.h

@@ -25,11 +25,9 @@ extern BOOL ValidateProductSuite(LPSTR SuiteName);
 extern BOOL TerminateProcessById(DWORD dwProcessId);
 extern BOOL AddAceToWindowStation(HWINSTA hwinsta, PSID psid);
 extern BOOL AddAceToDesktop(HDESK hdesk, PSID psid);
-
-extern BOOL
-GetAccountSid(
+extern BOOL GetAccountSid(
     LPCTSTR SystemName,         // where to lookup account
     LPCTSTR AccountName,        // account of interest
     PSID *Sid                   // resultant buffer containing SID
 );
-
+extern int suspend_or_resume_threads(DWORD pid, bool resume);