<html><head><style type="text/css"></style></head><body><div style="font-family:'Courier New', courier, monaco, monospace, sans-serif;font-size:10pt"><div></div><div>Had you take a look on how aptcc handles cancel?</div><div>Since zypp is a C++ backend too you can sure</div><div>use this way.</div><div><br></div><div>First store a pointer in the pk-object to a bool* cancel;</div><div>on the pk_cancel() you set cancel = true;</div><div>then on the methods you use you do a few checks</div><div>if (cancel) { break; } or something...</div><div><br></div><div>Best.<br> </div>________________________________<br>Daniel Nicoletti - KDE Developer<br><span><a target="_blank" href="http://dantti.wordpress.com">http://dantti.wordpress.com</a></span><br>When a wicked man dies, his hope perishes;<br>all he expected from his power comes to nothing. Prov. 11:7<div><br></div><blockquote style="border-left: 2px solid rgb(16, 16, 255); margin-left: 5px; padding-left: 5px;"><div style="font-family:Courier New, courier, monaco, monospace, sans-serif;font-size:10pt"><br><div style="font-family:times new roman, new york, times, serif;font-size:12pt"><font size="2" face="Tahoma"><b><span style="font-weight: bold;">De:</span></b> "Zhang, Qiang Z" <qiang.z.zhang@intel.com><br><b><span style="font-weight: bold;">Para:</span></b> "hughsient@gmail.com" <hughsient@gmail.com><br><b><span style="font-weight: bold;">Cc:</span></b> "packagekit@lists.freedesktop.org" <packagekit@lists.freedesktop.org><br><b><span style="font-weight: bold;">Enviadas:</span></b> Quinta-feira, 16 de Dezembro de 2010 1:01:12<br><b><span style="font-weight: bold;">Assunto:</span></b> [packagekit] (no subject)<br></font><br><meta http-equiv="x-dns-prefetch-control" content="off"> <style></style> <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> <meta http-equiv="x-dns-prefetch-control" content="on"></div></div></blockquote><div style="position:fixed"></div> </div><br>  </body></html>