我不知道这是否是设计使然，但我似乎无法以标准用户或高级用户的身份在 Windows 7 上创建新的信号量。
SemaphoreSecurity semSec = new SemaphoreSecurity();
// have also tried "Power Users", "Everyone", etc.
SemaphoreAccessRule rule = new SemaphoreAccessRule("Users", SemaphoreRights.FullControl, AccessControlType.Allow);
semSec.AddAccessRule(rule);
bool createdNew = false;
// throws exception
sem = new Semaphore(1, 1, SEMAPHORE_ID, out createdNew, semSec);
return true;
我收到一条UnauthorizedAccessException消息“拒绝访问端口”。
这可能吗？
查看有关该主题的 MSDN 文档，似乎解决方案是为信号量创建设置安全级别。
这是给定链接的源代码摘录：
// The value of this variable is set by the semaphore
// constructor. It is true if the named system semaphore was
// created, and false if the named semaphore already existed.
//
bool semaphoreWasCreated;
// Create an access control list (ACL) that denies the
// current user the right to enter or release the
// semaphore, but allows the right to read and change
// security information for the semaphore.
//
string user = Environment.UserDomainName + "\\"
+ Environment.UserName;
SemaphoreSecurity semSec = new SemaphoreSecurity();
SemaphoreAccessRule rule = new SemaphoreAccessRule(
user,
SemaphoreRights.Synchronize | SemaphoreRights.Modify,
AccessControlType.Deny);
semSec.AddAccessRule(rule);
rule = new SemaphoreAccessRule(
user,
SemaphoreRights.ReadPermissions | SemaphoreRights.ChangePermissions,
AccessControlType.Allow);
semSec.AddAccessRule(rule);
// Create a Semaphore object that represents the system
// semaphore named by the constant 'semaphoreName', with
// maximum count three, initial count three, and the
// specified security access. The Boolean value that
// indicates creation of the underlying system object is
// placed in semaphoreWasCreated.
//
sem = new Semaphore(3, 3, semaphoreName,
out semaphoreWasCreated, semSec);
// If the named system semaphore was created, it can be
// used by the current instance of this program, even
// though the current user is denied access. The current
// program enters the semaphore. Otherwise, exit the
// program.
//
if (semaphoreWasCreated)
{
Console.WriteLine("Created the semaphore.");
}
else
{
Console.WriteLine("Unable to create the semaphore.");
return;
}
希望这可以帮助！
经过更多的研究和尝试，我终于解决了这个问题，
关键是在信号量名称前加上“Global\”，即
const string NAME = "Global\\MySemaphore";
谢谢。