2 * win32-ucontext: Unix ucontext_t operations on Windows platforms
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3 * Copyright(C) 2007 Panagiotis E. Hadjidoukas
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5 * Contact Email: phadjido@cs.uoi.gr, xdoukas@ceid.upatras.gr
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7 * win32-ucontext is free software; you can redistribute it and/or
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8 * modify it under the terms of the GNU Lesser General Public
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9 * License as published by the Free Software Foundation; either
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10 * version 2 of the License, or (at your option) any later version.
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12 * win32-ucontext is distributed in the hope that it will be useful,
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13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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15 * Lesser General Public License for more details.
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17 * You should have received a copy of the GNU Lesser General Public
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18 * License along with QueueUserAPCEx in the file COPYING.LIB;
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19 * if not, write to the Free Software Foundation, Inc.,
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20 * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
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23 #include "win32_ucontext.h"
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25 int getcontext(ucontext_t *ucp)
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29 /* Retrieve the full machine context */
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30 ucp->uc_mcontext.ContextFlags = CONTEXT_FULL;
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31 ret = GetThreadContext(GetCurrentThread(), &ucp->uc_mcontext);
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33 return (ret == 0) ? -1: 0;
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36 int setcontext(const ucontext_t *ucp)
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40 /* Restore the full machine context (already set) */
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41 ret = SetThreadContext(GetCurrentThread(), &ucp->uc_mcontext);
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43 return (ret == 0) ? -1: 0;
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46 int makecontext(ucontext_t *ucp, void (*func)(), int argc, ...)
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52 /* Stack grows down */
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53 sp = (char *) (size_t) ucp->uc_stack.ss_sp + ucp->uc_stack.ss_size;
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55 /* Reserve stack space for the arguments (maximum possible: argc*(8 bytes per argument)) */
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58 if ( sp < (char *)ucp->uc_stack.ss_sp) {
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59 /* errno = ENOMEM;*/
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63 /* Set the instruction and the stack pointer */
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64 ucp->uc_mcontext.Eip = (unsigned long) func;
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65 ucp->uc_mcontext.Esp = (unsigned long) sp - 4;
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67 /* Save/Restore the full machine context */
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68 ucp->uc_mcontext.ContextFlags = CONTEXT_FULL;
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70 /* Copy the arguments */
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71 va_start (ap, argc);
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72 for (i=0; i<argc; i++) {
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82 int swapcontext(ucontext_t *oucp, const ucontext_t *ucp)
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86 if ((oucp == NULL) || (ucp == NULL)) {
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91 ret = getcontext(oucp);
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93 ret = setcontext(ucp);
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