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Listing 9-1. pmemkv_config.h – An example of the pmemkv_config structure
using the C API
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#include
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#include
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#include
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pmemkv_config* config_setup(const char* path, const uint64_t fcreate,
const uint64_t size) {
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pmemkv_config *cfg = pmemkv_config_new();
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assert(cfg != nullptr);
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if (pmemkv_config_put_string(cfg, "path", path) != PMEMKV_STATUS_OK) {
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fprintf(stderr, "%s", pmemkv_errormsg());
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return NULL;
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}
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if (pmemkv_config_put_uint64(cfg, "force_create", fcreate) !=
PMEMKV_STATUS_OK) {
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fprintf(stderr, "%s", pmemkv_errormsg());
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return NULL;
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}
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if (pmemkv_config_put_uint64(cfg, "size", size) != PMEMKV_STATUS_OK) {
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fprintf(stderr, "%s", pmemkv_errormsg());
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return NULL;
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}
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return cfg;
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}
• Line 5: We define custom function to prepare config and set all
required params for engine(s) to use.
• Line 6: We create an instance of C config class. It returns nullptr on
failure.
Chapter 9 pmemkv: a persistent in- memory key-value store