-/* Copyright (c) 2015-2018. The SimGrid Team. All rights reserved. */
+/* Copyright (c) 2015-2019. The SimGrid Team. All rights reserved. */
/* This program is free software; you can redistribute it and/or modify it
* under the terms of the license (GNU LGPL) which comes with this package. */
++i;
if (i != map.end() && i->pathname.empty() && (i->prot & PROT_RWX) == PROT_RW &&
(char*)i->start_addr == smpi_data_exe_start + smpi_data_exe_size) {
- // Only count this region if it was not already present in the initial map.
- auto found = std::find_if(begin(initial_vm_map), end(initial_vm_map),
- [&i](const simgrid::xbt::VmMap& m) { return m.start_addr == i->start_addr; });
- if (found == end(initial_vm_map))
- smpi_data_exe_size = (char*)i->end_addr - smpi_data_exe_start;
+ // Only count the portion of this region not present in the initial map.
+ auto found = std::find_if(initial_vm_map.begin(), initial_vm_map.end(), [&i](const simgrid::xbt::VmMap& m) {
+ return i->start_addr <= m.start_addr && m.start_addr < i->end_addr;
+ });
+ auto end_addr = (found == initial_vm_map.end() ? i->end_addr : found->start_addr);
+ smpi_data_exe_size = (char*)end_addr - smpi_data_exe_start;
}
return;
}
#endif
}
-int smpi_is_privatization_file(char* file)
-{
- const std::string buffer_path("/dev/shm/my-buffer-");
- return buffer_path.compare(0, std::string::npos, file, buffer_path.length()) == 0;
-}
-
/**
* @brief Makes a backup of the segment in memory that stores the global variables of a process.
* This backup is then used to initialize the global variables for every single
char path[24];
int status;
- do {
- snprintf(path, sizeof(path), "/smpi-buffer-%06x", rand() % 0xffffffU);
+ constexpr unsigned VAL_MASK = 0xffffffU;
+ static unsigned prev_val = VAL_MASK;
+ for (unsigned i = (prev_val + 1) & VAL_MASK; i != prev_val; i = (i + 1) & VAL_MASK) {
+ snprintf(path, sizeof(path), "/smpi-buffer-%06x", i);
file_descriptor = shm_open(path, O_RDWR | O_CREAT | O_EXCL, S_IRUSR | S_IWUSR);
- } while (file_descriptor == -1 && errno == EEXIST);
+ if (file_descriptor != -1 || errno != EEXIST) {
+ prev_val = i;
+ break;
+ }
+ }
if (file_descriptor < 0) {
if (errno == EMFILE) {
xbt_die("Impossible to create temporary file for memory mapping: %s\n\
#endif
}
-static int sendbuffer_size = 0;
-static char* sendbuffer = nullptr;
-static int recvbuffer_size = 0;
-static char* recvbuffer = nullptr;
+static std::vector<unsigned char> sendbuffer;
+static std::vector<unsigned char> recvbuffer;
//allocate a single buffer for all sends, growing it if needed
-void* smpi_get_tmp_sendbuffer(int size)
+unsigned char* smpi_get_tmp_sendbuffer(size_t size)
{
if (not smpi_process()->replaying())
- return xbt_malloc(size);
- if (sendbuffer_size<size){
- sendbuffer=static_cast<char*>(xbt_realloc(sendbuffer,size));
- sendbuffer_size=size;
- }
- return sendbuffer;
+ return new unsigned char[size];
+ // FIXME: a resize() may invalidate a previous pointer. Maybe we need to handle a queue of buffers with a reference
+ // counter. The same holds for smpi_get_tmp_recvbuffer.
+ if (sendbuffer.size() < size)
+ sendbuffer.resize(size);
+ return sendbuffer.data();
}
//allocate a single buffer for all recv
-void* smpi_get_tmp_recvbuffer(int size){
+unsigned char* smpi_get_tmp_recvbuffer(size_t size)
+{
if (not smpi_process()->replaying())
- return xbt_malloc(size);
- if (recvbuffer_size<size){
- recvbuffer=static_cast<char*>(xbt_realloc(recvbuffer,size));
- recvbuffer_size=size;
- }
- return recvbuffer;
+ return new unsigned char[size];
+ if (recvbuffer.size() < size)
+ recvbuffer.resize(size);
+ return recvbuffer.data();
}
-void smpi_free_tmp_buffer(void* buf){
+void smpi_free_tmp_buffer(const unsigned char* buf)
+{
if (not smpi_process()->replaying())
- xbt_free(buf);
+ delete[] buf;
}
-void smpi_free_replay_tmp_buffers(){
- xbt_free(sendbuffer);
- xbt_free(recvbuffer);
+void smpi_free_replay_tmp_buffers()
+{
+ std::vector<unsigned char>().swap(sendbuffer);
+ std::vector<unsigned char>().swap(recvbuffer);
}