Method and apparatus for obtaining number for transaction-accessed variable in blockchain in parallel

A non-transitory computer readable storage medium, storing executable instructions, which when executed by a processor enable the processor to implement acts including:

• calculating a hash value m corresponding to a variable name of a first variable accessed in a first transaction in a blockchain, the hash value m being a value in pre-determined M values;
• performing a first atomic operation on an mth bit in a bitmap in a shared memory, the first atomic operation including:
• reading a current first value of the mth bit,
• setting the mth bit to 1, and
• returning the first value, the bitmap having M bits, and initial values of the M bits being 0;
• in response to the first value being 0, obtaining a first number uniquely corresponding to the first variable, the first number being a value in pre-determined N values, and N being less than M;
• and
• setting a value of an mth element in a mapping array in the shared memory based on the first number, the mapping array including a total of M elements,
• wherein the shared memory further stores a version number variable, the first transaction bein a transaction in a first batch of transactions;
• wherein the method comprises, before the first batch of transactions are processed, setting a value of the version number variable to be greater than a value of each element in the mapping array;
• and
• wherein the setting the value of the mth element in the mapping array in the shared memory based on the first number includes storing a sum of the first number and the value of the version number variable into the mth element in the mapping array.

A computing device, comprising a memory and a processor, the memory storing executable instructions, the executable instructions, when executed by the processor, configure the processor to implement acts including:

• calculating a hash value m corresponding to a variable name of a first variable accessed in a first transaction in a blockchain, the hash value m being a value in pre-determined M values;
• performing a first atomic operation on an mth bit in a bitmap in a shared memory, the first atomic operation including:
• reading a current first value of the mth bit,
• setting the mth bit to 1, and
• returning the first value, the bitmap having M bits, and initial values of the M bits being 0;
• in response to the first value being 0, obtaining a first number uniquely corresponding to the first variable, the first number being a value in pre-determined N values, and N being less than M;
• and
• setting a value of an mth element in a mapping array in the shared memory based on the first number, the mapping array including a total of M elements,
• wherein the shared memory further stores a version number variable and a version number array, the version number array including M elements, the first transaction being a transaction in a first hatch of transactions;
• and
• wherein the method comprises:
• before the first batch of transactions are processed, setting a value of the version number variable to be unequal to a value of each element in the version number array;
• and
• after the setting the value of the mth element in the mapping array based on the first number, modifying a value of an mth element in the version number array to be equal to a value of the version number variable.

A method, comprising:

• calculating a hash value m corresponding to a variable name of a first variable accessed in a first transaction in a blockchain, the hash value m being a value in pre-determined M values;
• performing a first atomic operation on an mth bit in a bitmap in a shared memory, the first atomic operation including:
• reading a current first value of the mth bit,
• setting the mth bit to 1, and
• returning the first value, the bitmap having M bits, and initial values of the M bits being 0;
• in response to the first value being 0, obtaining a first number uniquely corresponding to the first variable, the first number being a value in pre-determined N values, and N being less than M;
• and
• setting a value of an mth element in a mapping array in the shared memory based on the first number, the mapping array including a total of M elements,
• wherein the shared memory further stores a version number variable, the first transaction being a transaction in a first batch of transactions;
• wherein the method comprises, before the first batch of transactions are processed, setting a value of the version number variable to be greater than a value of each element in the mapping array;
• and
• wherein the setting the value of the mth element in the mapping array in the shared memory based on the first number includes storing a sum of the first number and the value of the version number variable into the mth element in the mapping array.