064ea89caa
a deadlock has been observed with samterm (thanks burnzez), that shows the mouse ioproc being stuck in sending on the resize channel, while the mouse consumer is stuck in a readmouse() loop wanting a rectangle to be drawn by the user: recv(v=0x42df50)+0x28 /sys/src/libthread/channel.c:321 readmouse(mc=0x42df50)+0x54 /sys/src/libdraw/mouse.c:34 getrect(.ret=0x41bce0,but=0x4,mc=0x42df50)+0x62 /sys/src/libdraw/getrect.c:49 r=0x41bc70 rc=0x41bc70 getr(rp=0x41bce0)+0x24 /sys/src/cmd/samterm/main.c:244 p=0x6b000004f6 r=0x2 sweeptext(new=0x0,tag=0x2d)+0x12 /sys/src/cmd/samterm/menu.c:208 r=0x2 t=0x42df50 inmesg(type=0x2,count=0x2)+0x1ab /sys/src/cmd/samterm/mesg.c:136 m=0x10000002d l=0x2d00001b00 i=0x43829000000001 t=0x438290 lp=0x42e050 rcv()+0x7a /sys/src/cmd/samterm/mesg.c:77 threadmain(argv=0x7ffffeffef90)+0x173 /sys/src/cmd/samterm/main.c:63 so avoid blocking in the mouse ioproc by using nbsend() instead of send() for writing to the resize channel. |
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