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///usr/bin/true; gcc -std=c2x -Wall -Wextra -Wpedantic -pedantic-errors -fanalyzer -Wanalyzer-too-complex -ggdb -g3 -O0 main.c -o main && ./main; exit $?
#include <asm-generic/errno-base.h>
#include <stdlib.h>
#include <errno.h>
#include <error.h>
#include <threads.h>
#define RETURNWERR(eval, rval) do { \
errno = (eval); \
return (rval); \
} while (0)
#define ERROR(exitval, errval, msg, __VA_ARGS__) do { \
error((exitval), (errval), (msg)__VA_ARGS__); \
abort(); \
} while (0)
void * xcalloc(size_t nmemb, size_t size) {
void *mem = calloc(nmemb, size);
if(!mem)
ERROR(-1, errno, "<xcalloc> failed to allocate memory ", );
return mem;
}
typedef int (*gcallback)(void*);
typedef void (*fcallback)(void*);
typedef struct gdata {
void *data;
fcallback fcb;
} gdata;
gdata * gdata_init(void *data, fcallback fcb) {
gdata *gd = xcalloc(1, sizeof(*gd));
gd->data = data;
gd->fcb = fcb;
return gd;
}
void gdata_free(void *gd) {
if(!gd)
return;
gdata *real = (gdata*)gd;
if(real->fcb != NULL)
real->fcb(real->data);
free(real);
return;
}
void * gdata_getdata(gdata * const gd) {
if(!gd)
RETURNWERR(EINVAL, NULL);
return gd->data;
}
void * gdata_destruct(gdata *gd) {
if(!gd)
RETURNWERR(EINVAL, NULL);
void *data = gdata_getdata(gd);
free(gd);
return data;
}
typedef struct stack {
gdata **arr;
int size;
int used;
} stack;
stack * stack_init(int size) {
if(size < 1)
RETURNWERR(EINVAL, NULL);
stack *st = xcalloc(1, sizeof(*st));
st->size = size;
st->used = 0;
st->arr = xcalloc(st->size, sizeof(gdata*));
return st;
}
void stack_free(void *st) {
if(!st)
return;
stack *real = (stack*)st;
for(int i = 0; i < real->used; i++)
gdata_free(real->arr[i]);
free(real->arr);
free(real);
return;
}
int stack_push(stack *st, gdata *gd) {
if(!st || !gd)
RETURNWERR(EINVAL, -1);
if(!(st->used < st->size))
RETURNWERR(ENOMEM, 0);
st->arr[st->used++] = gd;
return st->used;
}
gdata * stack_pop(stack *st) {
if(!st)
RETURNWERR(EINVAL, NULL);
if(st->used <= 0)
RETURNWERR(ENODATA, 0);
return st->arr[--st->used];
}
int stack_pushd(stack *st, void *data, fcallback fcb) {
if(!st)
RETURNWERR(EINVAL, -1);
gdata *gd = gdata_init(data, fcb);
int retval = stack_push(st, gd);
if(retval <= 0)
gdata_free(gd);
return retval;
}
void * stack_popd(stack *st) {
if(!st)
RETURNWERR(EINVAL, NULL);
gdata *gd = stack_pop(st);
if(!gd)
return NULL;
return gdata_destruct(gd);
}
typedef struct cstack {
stack *st;
mtx_t mutex;
cnd_t cond;
unsigned char canceled;
} cstack;
cstack * cstack_init(int size) {
if(size < 1)
RETURNWERR(EINVAL, NULL);
cstack *cst = xcalloc(1, sizeof(*cst));
cst->st = stack_init(size);
cst->canceled = 0;
mtx_init(&cst->mutex, mtx_plain);
cnd_init(&cst->cond);
return cst;
}
int cstack_cancel(cstack * const cst) {
if(!cst)
RETURNWERR(EINVAL, -1);
mtx_lock(&cst->mutex);
cst->canceled = 1;
mtx_unlock(&cst->mutex);
cnd_broadcast(&cst->cond);
return 0;
}
void cstack_free(void *cst) {
if(!cst)
return;
cstack *real = (cstack*)cst;
cstack_cancel(real);
// Ok I don't think there's a good way to wait for all threads to die without registering the threads
return;
}
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