int
erts_sys_getenv_raw(char *key, char *value, size_t *size)
{
int res;
erts_rwmtx_rlock(&environ_rwmtx);
res = erts_sys_getenv__(key, value, size);
erts_rwmtx_runlock(&environ_rwmtx);
return res;
}
static ErtsMsAcc* get_msacc(void) {
ErtsMsAcc *msacc;
erts_rwmtx_rlock(&msacc_mutex);
msacc = msacc_managed;
while (!erts_equal_tids(msacc->tid,erts_thr_self())) {
msacc = msacc->next;
ASSERT(msacc != NULL);
}
erts_rwmtx_runlock(&msacc_mutex);
return msacc;
}
int erts_sys_unsetenv(char *key)
{
int res = 0;
WCHAR *wkey = (WCHAR *) key;
SetLastError(0);
erts_rwmtx_rlock(&environ_rwmtx);
GetEnvironmentVariableW(wkey,
NULL,
0);
if (GetLastError() != ERROR_ENVVAR_NOT_FOUND) {
res = (SetEnvironmentVariableW(wkey,
NULL) ? 0 : 1);
}
erts_rwmtx_runlock(&environ_rwmtx);
return res;
}
char*
win_build_environment(char* new_env)
{
if (new_env == NULL) {
return NULL;
} else {
WCHAR *tmp, *merged, *tmp_new;
tmp_new = (WCHAR *) new_env;
erts_rwmtx_rlock(&environ_rwmtx);
tmp = GetEnvironmentStringsW();
merged = merge_environment(tmp, tmp_new);
FreeEnvironmentStringsW(tmp);
erts_rwmtx_runlock(&environ_rwmtx);
return (char *) merged;
}
}
int
erts_sys_getenv(char *key, char *value, size_t *size)
{
size_t req_size = 0;
int res = 0;
DWORD new_size;
WCHAR *wkey = (WCHAR *) key;
WCHAR *wvalue = (WCHAR *) value;
DWORD wsize = *size / (sizeof(WCHAR) / sizeof(char));
SetLastError(0);
erts_rwmtx_rlock(&environ_rwmtx);
new_size = GetEnvironmentVariableW(wkey,
wvalue,
(DWORD) wsize);
res = !new_size && GetLastError() == ERROR_ENVVAR_NOT_FOUND ? -1 : 0;
erts_rwmtx_runlock(&environ_rwmtx);
if (res < 0)
return res;
res = new_size > wsize ? 1 : 0;
*size = new_size * (sizeof(WCHAR) / sizeof(char));
return res;
}
void fini_getenv_state(GETENV_STATE *state)
{
FreeEnvironmentStringsW(state->environment_strings);
state->environment_strings = state->next_string = NULL;
erts_rwmtx_runlock(&environ_rwmtx);
}
/*
* This function is responsible for enabling, disabling, resetting and
* gathering data related to microstate accounting.
*
* Managed threads and unmanaged threads are handled differently.
* - managed threads get a misc_aux job telling them to switch on msacc
* - unmanaged have some fields protected by a mutex that has to be taken
* before any values can be updated
*
* For performance reasons there is also a global value erts_msacc_enabled
* that controls the state of all threads. Statistics gathering is only on
* if erts_msacc_enabled && msacc is true.
*/
Eterm
erts_msacc_request(Process *c_p, int action, Eterm *threads)
{
#ifdef ERTS_ENABLE_MSACC
ErtsMsAcc *msacc = ERTS_MSACC_TSD_GET();
ErtsSchedulerData *esdp = erts_proc_sched_data(c_p);
Eterm ref;
ErtsMSAccReq *msaccrp;
Eterm *hp;
#ifdef ERTS_MSACC_ALWAYS_ON
if (action == ERTS_MSACC_ENABLE || action == ERTS_MSACC_DISABLE)
return THE_NON_VALUE;
#else
/* take care of double enable, and double disable here */
if (msacc && action == ERTS_MSACC_ENABLE) {
return THE_NON_VALUE;
} else if (!msacc && action == ERTS_MSACC_DISABLE) {
return THE_NON_VALUE;
}
#endif
ref = erts_make_ref(c_p);
msaccrp = erts_alloc(ERTS_ALC_T_MSACC, sizeof(ErtsMSAccReq));
hp = &msaccrp->ref_heap[0];
msaccrp->action = action;
msaccrp->proc = c_p;
msaccrp->ref = STORE_NC(&hp, NULL, ref);
msaccrp->req_sched = esdp->no;
#ifdef ERTS_SMP
*threads = erts_no_schedulers;
*threads += 1; /* aux thread */
#else
*threads = 1;
#endif
erts_smp_atomic32_init_nob(&msaccrp->refc,(erts_aint32_t)*threads);
erts_proc_add_refc(c_p, *threads);
if (erts_no_schedulers > 1)
erts_schedule_multi_misc_aux_work(1,
erts_no_schedulers,
reply_msacc,
(void *) msaccrp);
#ifdef ERTS_SMP
/* aux thread */
erts_schedule_misc_aux_work(0, reply_msacc, (void *) msaccrp);
#endif
#ifdef USE_THREADS
/* Manage unmanaged threads */
switch (action) {
case ERTS_MSACC_GATHER: {
Uint unmanaged_count;
ErtsMsAcc *msacc, **unmanaged;
int i = 0;
/* we copy a list of pointers here so that we do not have to have
the msacc_mutex when sending messages */
erts_rwmtx_rlock(&msacc_mutex);
unmanaged_count = msacc_unmanaged_count;
unmanaged = erts_alloc(ERTS_ALC_T_MSACC,
sizeof(ErtsMsAcc*)*unmanaged_count);
for (i = 0, msacc = msacc_unmanaged;
i < unmanaged_count;
i++, msacc = msacc->next) {
unmanaged[i] = msacc;
}
erts_rwmtx_runlock(&msacc_mutex);
for (i = 0; i < unmanaged_count; i++) {
erts_mtx_lock(&unmanaged[i]->mtx);
if (unmanaged[i]->perf_counter) {
ErtsSysPerfCounter perf_counter;
/* if enabled update stats */
perf_counter = erts_sys_perf_counter();
unmanaged[i]->perf_counters[unmanaged[i]->state] +=
perf_counter - unmanaged[i]->perf_counter;
unmanaged[i]->perf_counter = perf_counter;
}
erts_mtx_unlock(&unmanaged[i]->mtx);
send_reply(unmanaged[i],msaccrp);
}
erts_free(ERTS_ALC_T_MSACC,unmanaged);
/* We have just sent unmanaged_count messages, so bump no of threads */
*threads += unmanaged_count;
break;
}
case ERTS_MSACC_RESET: {
ErtsMsAcc *msacc;
erts_rwmtx_rlock(&msacc_mutex);
for (msacc = msacc_unmanaged; msacc != NULL; msacc = msacc->next)
erts_msacc_reset(msacc);
erts_rwmtx_runlock(&msacc_mutex);
break;
}
case ERTS_MSACC_ENABLE: {
erts_rwmtx_rlock(&msacc_mutex);
for (msacc = msacc_unmanaged; msacc != NULL; msacc = msacc->next) {
erts_mtx_lock(&msacc->mtx);
msacc->perf_counter = erts_sys_perf_counter();
/* we assume the unmanaged thread is sleeping */
msacc->state = ERTS_MSACC_STATE_SLEEP;
erts_mtx_unlock(&msacc->mtx);
}
erts_rwmtx_runlock(&msacc_mutex);
break;
}
case ERTS_MSACC_DISABLE: {
ErtsSysPerfCounter perf_counter;
erts_rwmtx_rlock(&msacc_mutex);
/* make sure to update stats with latest results */
for (msacc = msacc_unmanaged; msacc != NULL; msacc = msacc->next) {
erts_mtx_lock(&msacc->mtx);
perf_counter = erts_sys_perf_counter();
msacc->perf_counters[msacc->state] += perf_counter - msacc->perf_counter;
msacc->perf_counter = 0;
erts_mtx_unlock(&msacc->mtx);
}
erts_rwmtx_runlock(&msacc_mutex);
break;
}
default: { ASSERT(0); }
}
#endif
*threads = make_small(*threads);
reply_msacc((void *) msaccrp);
#ifndef ERTS_MSACC_ALWAYS_ON
/* enable/disable the global value */
if (action == ERTS_MSACC_ENABLE) {
erts_msacc_enabled = 1;
} else if (action == ERTS_MSACC_DISABLE) {
erts_msacc_enabled = 0;
}
#endif
return ref;
#else
return THE_NON_VALUE;
#endif
}