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/* MIT License
*
* Copyright (c) 2021 Tyge Løvset, NORCE, www.norceresearch.no
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
/* csptr: shared_ptr type
#include <stc/cstr.h>
typedef struct { cstr name, last; } Person;
Person Person_init(const char* name, const char* last) {
return (Person){.name = cstr_from(name), .last = cstr_from(last)};
}
void Person_del(Person* p) {
printf("del: %s %s\n", p->name.str, p->last.str);
c_del(cstr, &p->name, &p->last);
}
#define i_tag person
#define i_val Person
#define i_valdel Person_del
#include <stc/csptr.h>
int main() {
csptr_person p = csptr_person_make(Person_init("John", "Smiths"));
csptr_person q = csptr_person_clone(p); // share the pointer
printf("%s %s. uses: %zu\n", q.get->name.str, q.get->last.str, *q.use_count);
c_del(csptr_person, &p, &q);
}
*/
#ifndef CSPTR_H_INCLUDED
#define CSPTR_H_INCLUDED
#include "ccommon.h"
#include "forward.h"
#include <stdlib.h>
typedef long atomic_count_t;
#if defined(__GNUC__) || defined(__clang__)
#define c_atomic_increment(v) (void)__atomic_add_fetch(v, 1, __ATOMIC_SEQ_CST)
#define c_atomic_decrement(v) __atomic_sub_fetch(v, 1, __ATOMIC_SEQ_CST)
#elif defined(_MSC_VER)
#include <intrin.h>
#define c_atomic_increment(v) (void)_InterlockedIncrement(v)
#define c_atomic_decrement(v) _InterlockedDecrement(v)
#elif defined(__i386__) || defined(__x86_64__)
STC_INLINE void c_atomic_increment(atomic_count_t* v)
{ __asm__ __volatile__("lock; incq %0" :"=m"(*v) :"m"(*v)); }
STC_INLINE atomic_count_t c_atomic_decrement(atomic_count_t* v) {
atomic_count_t r;
__asm__ __volatile__("lock; xadd %0, %1" :"=r"(r) :"m"(*v), "0"(-1));
return r - 1;
}
#endif
#define csptr_null {NULL, NULL}
#endif // CSPTR_H_INCLUDED
#ifndef i_prefix
#define i_prefix csptr_
#endif
#include "template.h"
#ifdef i_nonatomic
#define cx_increment(v) (++*(v))
#define cx_decrement(v) (--*(v))
#else
#define cx_increment(v) c_atomic_increment(v)
#define cx_decrement(v) c_atomic_decrement(v)
#endif
#ifndef i_fwd
_cx_deftypes(_c_csptr_types, _cx_self, i_val);
#endif
#define cx_csptr_rep struct _cx_memb(_rep_)
cx_csptr_rep { atomic_count_t counter; _cx_value_t value; };
STC_INLINE _cx_self
_cx_memb(_init)(void) { return c_make(_cx_self){NULL, NULL}; }
STC_INLINE atomic_count_t
_cx_memb(_use_count)(_cx_self ptr) { return ptr.use_count ? *ptr.use_count : 0; }
STC_INLINE _cx_self
_cx_memb(_from)(_cx_value_t* p) {
_cx_self ptr = {p};
if (p) *(ptr.use_count = c_new(atomic_count_t)) = 1;
return ptr;
}
STC_INLINE _cx_self
_cx_memb(_make)(_cx_value_t val) {
_cx_self ptr; cx_csptr_rep *rep = c_new(cx_csptr_rep);
*(ptr.use_count = &rep->counter) = 1;
*(ptr.get = &rep->value) = val;
return ptr;
}
STC_INLINE _cx_self
_cx_memb(_clone)(_cx_self ptr) {
if (ptr.use_count) cx_increment(ptr.use_count);
return ptr;
}
STC_INLINE _cx_self
_cx_memb(_move)(_cx_self* self) {
_cx_self ptr = *self;
self->get = NULL, self->use_count = NULL;
return ptr;
}
STC_INLINE void
_cx_memb(_del)(_cx_self* self) {
if (self->use_count && cx_decrement(self->use_count) == 0) {
i_valdel(self->get);
if (self->get != &((cx_csptr_rep *)self->use_count)->value)
c_free(self->get);
c_free(self->use_count);
}
}
STC_INLINE void
_cx_memb(_reset)(_cx_self* self) {
_cx_memb(_del)(self);
self->use_count = NULL, self->get = NULL;
}
STC_INLINE void
_cx_memb(_reset_from)(_cx_self* self, _cx_value_t* p) {
_cx_memb(_del)(self);
*self = _cx_memb(_from)(p);
}
STC_INLINE void
_cx_memb(_reset_with)(_cx_self* self, _cx_value_t val) {
_cx_memb(_del)(self);
*self = _cx_memb(_make)(val);
}
STC_INLINE void
_cx_memb(_copy)(_cx_self* self, _cx_self ptr) {
if (ptr.use_count) cx_increment(ptr.use_count);
_cx_memb(_del)(self); *self = ptr;
}
STC_INLINE void
_cx_memb(_take)(_cx_self* self, _cx_self ptr) {
if (self->get != ptr.get) _cx_memb(_del)(self);
*self = ptr;
}
STC_INLINE int
_cx_memb(_compare)(const _cx_self* x, const _cx_self* y) {
return i_cmp(x->get, y->get);
}
#undef cx_csptr_rep
#undef cx_increment
#undef cx_decrement
#undef i_nonatomic
#include "template.h"
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