#include #include #include "epoll2.h" #include "die.h" void set_epoll_descriptor(int fd_epoll, int action, int fd_toadd, int events) { int ret; struct epoll_event ev; memset(&ev, 0, sizeof(ev)); ev.events = events; ev.data.fd = fd_toadd; ret = epoll_ctl(fd_epoll, action, fd_toadd, &ev); if (ret < 0) panic("Cannot add socket for epoll!\n"); } int set_epoll_descriptor2(int fd_epoll, int action, int fd_toadd, int events) { struct epoll_event ev; memset(&ev, 0, sizeof(ev)); ev.events = events; ev.data.fd = fd_toadd; return epoll_ctl(fd_epoll, action, fd_toadd, &ev); } it repository'/>
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authorVineet Gupta <vgupta@synopsys.com>2016-10-20 07:39:45 -0700
committerVineet Gupta <vgupta@synopsys.com>2016-10-24 09:24:26 -0700
commit91e040a79df73d371f70792f30380d4e44805250 (patch)
treeb2732eadb60fc5575c465a81cc637a899330c1b5 /Documentation
parent1dec78585328db00e33fb18dc1a6deed0e2095a5 (diff)
ARC: syscall for userspace cmpxchg assist
Older ARC700 cores (ARC750 specifically) lack instructions to implement atomic r-w-w. This is problematic for userspace libraries such as NPTL which need atomic primitives. So enable them by providing kernel assist. This is costly but really the only sane soluton (othern than tight spinning using the otherwise availiable atomic exchange EX instruciton). Good thing is there are only a few of these cores running Linux out in the wild. This only works on UP systems. Reviewed-by: Colin Ian King <colin.king@canonical.com> Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
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