allocation

Freeing memory error?

由 半腔热情 提交于 2020-12-23 11:52:32
问题 I need to free the bitpointer , because this function is executed multiple times and memory usage is growing for a reason I don't understand and it crashes after reaching 22mb of ram usage.. If I try to delete the bitpointer like this delete []bitpointer or free(bitpointer) I get access violation error. But I don't understand why, because the function shouldn't use the pointer any more and the new red blue green values are set.. void Get_Color(int x,int y,int w,int h,int &red,int &green,int

Freeing memory error?

由 吃可爱长大的小学妹 提交于 2020-12-23 11:51:29
问题 I need to free the bitpointer , because this function is executed multiple times and memory usage is growing for a reason I don't understand and it crashes after reaching 22mb of ram usage.. If I try to delete the bitpointer like this delete []bitpointer or free(bitpointer) I get access violation error. But I don't understand why, because the function shouldn't use the pointer any more and the new red blue green values are set.. void Get_Color(int x,int y,int w,int h,int &red,int &green,int

malloc()和calloc()

由 痞子三分冷 提交于 2020-11-17 07:15:46
malloc()和calloc() 进程对动态内存的请求被认为是不紧迫的。例如，当进程的可执行文件被装入时，进程并不一定立即对所有的代码进行访问。类似地，当进程调用malloc() 请求动态内存时，并不意味着进程很快就会访问所有获得的内存。因此一般来说，内核总是尽量推迟给用户态进程动态分配内存。 The kernel succeeds in deferring the allocation of dynamic memory to processes by using a new kind of resource. When a User Mode process asks for dynamic memory, it doesn't get additional page frames; instead, it gets the right to use a new range of linear addresses, which become part of its address space. This interval is called a "memory region." 内核使用一种资源成功实现了对进程动态内存的推迟分配。当用户态进程请求动态内存时，并没有获得请求的页框，而仅仅获得对一个新的线性地址区的使用权，而这一线性地址区间就成为进程地址空间的一部分

How do I allocate an array at runtime in Rust?

由 你说的曾经没有我的故事 提交于 2020-08-04 14:49:17
问题 Once I have allocated the array, how do I manually free it? Is pointer arithmetic possible in unsafe mode? Like in C++: double *A=new double[1000]; double *p=A; int i; for(i=0; i<1000; i++) { *p=(double)i; p++; } delete[] A; Is there any equivalent code in Rust? 回答1: Based on your question, I'd recommend reading the Rust Book if you haven't done so already. Idiomatic Rust will almost never involve manually freeing memory. As for the equivalent to a dynamic array, you want Vector. Unless you

How do I allocate an array at runtime in Rust?

由 我的梦境 提交于 2020-08-04 14:47:09
问题 Once I have allocated the array, how do I manually free it? Is pointer arithmetic possible in unsafe mode? Like in C++: double *A=new double[1000]; double *p=A; int i; for(i=0; i<1000; i++) { *p=(double)i; p++; } delete[] A; Is there any equivalent code in Rust? 回答1: Based on your question, I'd recommend reading the Rust Book if you haven't done so already. Idiomatic Rust will almost never involve manually freeing memory. As for the equivalent to a dynamic array, you want Vector. Unless you

How do I allocate an array at runtime in Rust?

由 断了今生、忘了曾经 提交于 2020-08-04 14:46:12
问题 Once I have allocated the array, how do I manually free it? Is pointer arithmetic possible in unsafe mode? Like in C++: double *A=new double[1000]; double *p=A; int i; for(i=0; i<1000; i++) { *p=(double)i; p++; } delete[] A; Is there any equivalent code in Rust? 回答1: Based on your question, I'd recommend reading the Rust Book if you haven't done so already. Idiomatic Rust will almost never involve manually freeing memory. As for the equivalent to a dynamic array, you want Vector. Unless you

Difference between memory allocations of struct member (pointer vs. array) in C

由 孤街浪徒 提交于 2020-05-16 19:10:50
问题 Is there any effective difference between these two styles of allocating memory? 1. typedef struct { uint8_t *buffer; } Container; Container* init() { Container* container = calloc(sizeof(Container), 1); container->buffer = calloc(4, 1); return container; } 2. typedef struct { uint8_t buffer[4]; } Container; Container* init() { Container* container = calloc(sizeof(Container), 1); return container; } As far as I understand, the whole Container struct will be heap allocated and buffer will

gsoap response memory allocation nested structure

由 杀马特。学长 韩版系。学妹 提交于 2020-03-25 21:51:47
问题 Im trying to find the right way of allocation memory for the following structure. struct part1 { char* c1; char* c2; } struct part2 { int a; struct part1 *local; } struct response { struct part1* p1; struct part2* p2; } This is what I do, as gathered from the documents. int myservice ( soap *soap, struct request *request, struct response *resp) { ... // top level resp is setup by soap_serve resp->p1 = soap_new_ns__part1(soap,1); resp->p1->c1 = soap_new_string(soap,10); (also tried soap_malloc

Does Xcode's Debug Navigator work different from Instruments allocations?

由 你说的曾经没有我的故事 提交于 2020-01-24 03:54:29
问题 I'm trying to find memory issues in my app. When I use Xcode's debug navigator for memory issues I see increase in the overall usage of the application. For a specific flow, when I go back and forth I don't see memory being persisted. However if I go through same flow and instrument using Allocations, I do see 3Mbs getting persisted every time I go back and forth. Is Xcode's debug navigator not reliable or they're measuring something different or something else?! EDIT: So I've been told the
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