diff options
Diffstat (limited to 'libco/ucontext.c')
-rw-r--r-- | libco/ucontext.c | 81 |
1 files changed, 0 insertions, 81 deletions
diff --git a/libco/ucontext.c b/libco/ucontext.c deleted file mode 100644 index 3e21816..0000000 --- a/libco/ucontext.c +++ /dev/null @@ -1,81 +0,0 @@ -/* - libco.ucontext (2008-01-28) - author: Nach - license: public domain -*/ - -/* - * WARNING: the overhead of POSIX ucontext is very high, - * assembly versions of libco or libco_sjlj should be much faster - * - * This library only exists for two reasons: - * 1 - as an initial test for the viability of a ucontext implementation - * 2 - to demonstrate the power and speed of libco over existing implementations, - * such as pth (which defaults to wrapping ucontext on unix targets) - * - * Use this library only as a *last resort* - */ - -#define LIBCO_C -#include <libco.h> -#include <stdlib.h> -#include <ucontext.h> - -#ifdef __cplusplus -extern "C" { -#endif - -static thread_local ucontext_t co_primary; -static thread_local ucontext_t *co_running = 0; - -cothread_t co_active(void) -{ - if (!co_running) - co_running = &co_primary; - return (cothread_t)co_running; -} - -cothread_t co_create(unsigned int heapsize, void (*coentry)(void)) -{ - if (!co_running) - co_running = &co_primary; - ucontext_t *thread = (ucontext_t*)malloc(sizeof(ucontext_t)); - - if(thread) - { - if((!getcontext(thread) && !(thread->uc_stack.ss_sp = 0)) && (thread->uc_stack.ss_sp = malloc(heapsize))) - { - thread->uc_link = co_running; - thread->uc_stack.ss_size = heapsize; - makecontext(thread, coentry, 0); - } - else - { - co_delete((cothread_t)thread); - thread = 0; - } - } - return (cothread_t)thread; -} - -void co_delete(cothread_t cothread) -{ - if (!cothread) - return; - - if(((ucontext_t*)cothread)->uc_stack.ss_sp) - free(((ucontext_t*)cothread)->uc_stack.ss_sp); - free(cothread); -} - -void co_switch(cothread_t cothread) -{ - ucontext_t *old_thread = co_running; - - co_running = (ucontext_t*)cothread; - swapcontext(old_thread, co_running); -} - -#ifdef __cplusplus -} -#endif |