<html> <head> <meta http-equiv="Content-Type" content="text/html; charset=us-ascii"> <meta name="Generator" content="Microsoft Exchange Server">  <style></style> </head> <body> <font face="Calibri, sans-serif" size="2"> <div>Hi Richard,</div> <div> </div> <div>I want to implemented the cancel API for zypp backend. But have not found the proper way.</div> <div> </div> <div>I have reviewed the cancel method of other backends, and found it’s easy to call pk_backend_spawn_kill (spawn) if backend use PkBackendSpawn.</div> <div> </div> <div>But for the backend,  which don’t use PkBackendSpawn,  it’s complicated to implemented this transaction cancel method. Such as poldek, which call poldek’s sigint_emit () to cancel transaction and sigint_emit is implemented in poldek but not PackageKit.</div> <div> </div> <div>Most of the other backends just set the transaction status and do nothing.</div> <div><font face="Times New Roman, serif"> </font></div> <div>I think, can PackageKit provide a function pk_backend_thread_cancel in pk-backend.c to send signal to the backend thread, the signal handler in thread can release some resources then call g_thread_exit to exit.</div> <div>Then all the backend use thread can call pk_backend_thread_cancel to cancel transaction.</div> <div> </div> <div>Or any other method?</div> <div> </div> <div> </div> <div>-Thanks</div> <div>-Xiaoqiang</div> <div><font face="Times New Roman, serif"> </font></div> <div><font face="Times New Roman, serif"> </font></div> </font> </body> </html>