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author | Petter Rodhelind <petter.rodhelind@gmail.com> | 2020-02-11 13:40:11 +0100 |
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committer | Petter Rodhelind <petter.rodhelind@gmail.com> | 2020-02-11 13:40:11 +0100 |
commit | 9c79e48c93c0c4d14aabcb490fab048d68934cb2 (patch) | |
tree | 1d57d3fd193621a2357473bb65b92190914c5736 /src/libthread/386-ucontext.c | |
parent | 02d7aa8915f9c3a3288dab01f321eb94ba219e3b (diff) | |
parent | 0237dec768a4ee36ae9e18ce8566d2c999d78410 (diff) | |
download | plan9port-9c79e48c93c0c4d14aabcb490fab048d68934cb2.tar.gz plan9port-9c79e48c93c0c4d14aabcb490fab048d68934cb2.tar.bz2 plan9port-9c79e48c93c0c4d14aabcb490fab048d68934cb2.zip |
Merge remote-tracking branch 'upstream/master'
Diffstat (limited to 'src/libthread/386-ucontext.c')
-rw-r--r-- | src/libthread/386-ucontext.c | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/src/libthread/386-ucontext.c b/src/libthread/386-ucontext.c new file mode 100644 index 00000000..3afa9513 --- /dev/null +++ b/src/libthread/386-ucontext.c @@ -0,0 +1,22 @@ +#include "threadimpl.h" + +void +makecontext(ucontext_t *ucp, void (*func)(void), int argc, ...) +{ + int *sp; + + sp = USPALIGN(ucp, 4); + sp -= argc; + memmove(sp, &argc+1, argc*sizeof(int)); + *--sp = 0; /* return address */ + ucp->uc_mcontext.mc_eip = (long)func; + ucp->uc_mcontext.mc_esp = (int)sp; +} + +int +swapcontext(ucontext_t *oucp, ucontext_t *ucp) +{ + if(getcontext(oucp) == 0) + setcontext(ucp); + return 0; +} |