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Added two helper classes for dealing with restarts of ioctl() like

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syscalls.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@24903 a95241bf-73f2-0310-859d-f6bbb57e9c96
This commit is contained in:
Ingo Weinhold
2008-04-11 03:29:42 +00:00
parent bab4c3bbff
commit 89df64c56e
1 changed files with 43 additions and 0 deletions
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headers/private/kernel/syscall_restart.h
+43
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@@ -113,4 +113,47 @@ syscall_restart_ioctl_handle_post(status_t error)
}
struct IoctlSyscallFlagUnsetter {
IoctlSyscallFlagUnsetter()
{
struct thread *thread = thread_get_current_thread();
fWasSyscall = (atomic_and(&thread->flags, ~THREAD_FLAGS_IOCTL_SYSCALL)
& THREAD_FLAGS_IOCTL_SYSCALL) != 0;
}
~IoctlSyscallFlagUnsetter()
{
struct thread *thread = thread_get_current_thread();
if (fWasSyscall)
atomic_or(&thread->flags, THREAD_FLAGS_IOCTL_SYSCALL);
}
private:
bool fWasSyscall;
};
template<typename Type>
struct IoctlSyscallRestartWrapper {
IoctlSyscallRestartWrapper(const Type& result)
: fResult(result)
{
struct thread *thread = thread_get_current_thread();
atomic_or(&thread->flags, THREAD_FLAGS_IOCTL_SYSCALL);
}
~IoctlSyscallRestartWrapper()
{
struct thread *thread = thread_get_current_thread();
atomic_and(&thread->flags, ~THREAD_FLAGS_IOCTL_SYSCALL);
if (fResult < 0)
syscall_restart_ioctl_handle_post(fResult);
}
private:
const Type& fResult;
};
#endif // _KERNEL_SYSCALL_RESTART_H